Stata find substring. substr() may be used with text or binary strings.
Stata find substring and the https:// parts from these variables over a wide range of URLs. Jan 7, 2023 · Regular expressions can be very effective in cleansing string data. Characters listed in ignore() are removed. I want the Dec 13, 2018 · Hi Stata folks, I am working on a dataset where each ID is associated with a numeric value comprised of 0 and 1s. in the Stata Results window the Unicode substring of s, starting at character n1, for n2 display columns Can this command be applied in > this occasion? If not, is there any other command that can check > whether a string variable contains certain characters? > * * For searches and help try: * http://www. ). clear input div_unemp03 div_unemp04 div_unemp05 1 1 1 end foreach x of varlist *unemp* { local new = substr("`x Apr 20, 2023 · I have a string variable in Stata which includes the company names. n2 is not the last digit, but the (maximum) length of the substring. The first column shows the code you would use, the second column shows how your data might look like before applying the code, and the third column shows how your data would look like after applying the code. 4 You need the function _substr ()_ local first=substr ("hey",1,1) local second=substr ("hey",2,1) di "`first'" di "`second'" See help functions -> string functions Jamie Griffin >>> [email protected] 09/04/05 8:06 am >>> Hi all, Does anybody knows how to extract a substring of an arbitrary string in order to place it into a macro? More specifically, suppose i have a string "hey". Subscripts are given within [] and cannot be supplied on the left of the = sign. i. Nov 12, 2020 · Hi Everyone I have a basic question, which I still have not been able to solve. The code could look something like . Jul 7, 2019 · How to find out if a string contains a specific string in it? 07 Jul 2019, 12:13 Hey, what should I use in a conditional statement in order to execute a command only on observations whose string variable (their name) contains a specific phrase? For example, I'm looking for something like: Code: Description substr(s, tosub, pos) substitutes tosub into s at position pos. I have a set of IDs. com lookfor finds variables by searching for string, ignoring case, among the variable names and labels. To keep the matter Jul 30, 2014 · String course = Bachelor of Commerce - AD - Accounting-Maj; if you want to get subString of before '-' character use below line String requiredSubString = course. Smith” and “P. Regular expression functions in Stata Stata has the following regular expression functions: regexm (s, re) performs a match of a regular expression and evaluates to 1 if regular expression re (a string) is satisfied by the string s, otherwise returns 0 Mar 21, 2019 · Dear everyone, I would like to know if someone knows a STATA code that I can use to extract numeric part of a string variable in STATA. Suppose people are asked which sports they enjoy or something more interesting, like which statistical software they use routinely. I think Phil is correct so far as official Stata is concerned. com An invalid UTF-8 sequence in s or sf is replaced with a Unicode replacement character \ufffd before the search is performed. How do you that? With a string function. I found several suggested fixes on the web but they all Feb 15, 2020 · I have a large dataset with two string variables: people_attending and special_attendee: *Example generated by -dataex-. “Male” and “Female”, “yes” and “no”, and “R. Stata Name Functions Stata offers several functions for generating a safe name, as for use in generating variables or macros. Please could someone advise how I remove the "A"? I tried tried the following but it removed the last the last character from all ids. substr (x,1,length (x) - 2) and everything between the second and the last two characters is one substring with one character fewer: substr (x, 2, length (x) - 3) At some stage every serious Stata user has to browse the functions sections of the manual carefully, dry though they are! Nick [email protected] White, Justin Try this: This supports my prejudice that -substr()-, -subinstr()-, -length()- and -strpos()- (the best string quartet outside Vienna) are often overlooked because people suppose that the fancier regex stuff may be needed. Nov 16, 2022 · The usubstr () function has three arguments: the string, or string variable, from which we copy a substring; the position of the start of the substring; and the length of the substring to be copied. , gen newvar = subinstr (oldvar,"dis","reg",. Using Stata 12, I want to replace some substrings in a string variable. I have a day-month-year variable which is inconsistently inputted: some dates have a '0' in from of the combination (01012021 for January 1, 2021) and some do not (1012021 for January 1, 2021). Your closing question is about identifying cases (Stata says observations) for which a variable takes on a particular value and the answer is like Nov 16, 2022 · Regular expressions use a notation system that allows for matching complex patterns of text with minimal effort. The name is followed by eith JJ, you have to convert the variable to a string format using tostring (help tostring) and then extracting the first two digits with substr Please see help string_functions for substr details. If the characters are exotic, then -charlist- from SSC is a utility to find out what they are. Is there a way (ideally without using mata) to do something like (intuitively) In Stata they are always enclosed in quotation marks. There is a specific function in Stata 14+ to look for the last occurrence of a substring (e. Probably, the spaces are meaningless. How can you delete observations from a variable that contains strings that have the specific word for instance. com When working with binary strings, one can find the location of the binary 0 using strpos(s, char(0)). This seems like it should be simple, but looking through all the documentation and prior forum messages on strpos, substr, and regex, I haven't been able to find something that will work for the data I am using. The first byte position of s is pos = 1. strpos(haystack, needle) returns the location of the first occurrence of needle in haystack, 0 if needle does not occur, or 1 if needle is empty. Jun 5, 2015 · What Stata is objecting to: substr (cd) == "Alaska" is an illegal use of substr (). This video shows the application of String commands in Stata. 7, and so on. I normally count the possitions that i want and use the substring command, but my oldvar has contains different number of characters. I'm looking to extract the last four digits of a date formated as 07apr2021 to create a new variable, so right now i'm using gen year=substr (fiscal_year_ended,-4,. If n1<0, the starting position is interpreted as distance from the end of the string. 6. I want to Description subinstr(s, old, new) returns s with all occurrences of old changed to new. Use strpos() or strrpos() to find the byte-based location of a substring in a string. To install: ssc install dataex clear input str148 people_attending str16 Oct 23, 2021 · Using substring functions in Stata 16. Do not confuse substr() with substr(), which extracts substrings; see [M-5] substr( ). For example, if you were analyzing ICD-9-CM diagnosis codes, you might have data that look like recid dx1 dx2 dx3 84 4414 99811 4275 105 25013 3572 25063 255 51909 Description usubstr(s, n1, n2) returns the Unicode substring of s, starting at Unicode character n1, for a length of n2. If n1 < 0, n1 is interpreted as the distance from the last Unicode character of s; if n2 = . Apr 3, 2018 · I have a variable that contains alphanumeric strings of specific lengths, for example: Name variable: asdf1 asdg2 zxcv4 asdh3 qwer2 rtyu4 xcvb4 I want to delete observations which have 4 as the l Feb 28, 2022 · This is exactly what is needed, but people with similar questions might note the string functions strpos() to find the first occurrence of a character in a string (here of a comma) and substr() to extract a substring, which are doing much of the work inside the command split. Remarks and examples An invalid UTF-8 sequence in s or sf is replaced with a Unicode replacement character \ufffd before the search is performed. We will focus on using the substr (), strlen (), and subinstr () commands. Dec 21, 2017 · Hello I would appreciate any advice with my problem. Among these string functions are three functions that are related to regular expressions, regexm for matching, regexr for replacing and regexs for subexpressions. The first position of interest maybe nr 1 in some observations and number 15 in others. Oct 19, 2018 · Suppose I have a list of names under variable Names: Beckham, Benjamin Roy, Andrew R. Jul 1, 2019 · first, by using quotes, you instructed Stata to use the substr function on that string; second, the last element of the command (where you have "9") is the length of the substr, not the end point; so, just modify your command as follows: Diagnostics subinstr(s, old, new, cnt) and subinword(s, old, new, cnt) treat cnt < 0 as if cnt = 0 was specified; the original string s is returned. com> Prev by Date: Re: st: combine 2 margnisplot Next by Date: st: sensitivity and specificity after xtgee Previous by thread: Re: st: indicator for "if cell contains the word or phrase" Next The function, subinstr (), (or regular expression functions) will do it. com> Re: st: Re: finding a word within a string variable in Stata 12 From: Michael Mulcahy <mulcahy_uconn@yahoo. The first position of s is pos = 1. 1 23 Oct 2021, 05:18 Dear Statalist, I have a string variable "comment" stored as "strL" that contains a mix of numbers, characters and spaces . -charlist- ========== Finally, this utility may be of use or interest: =========== begin program def charlist should do it. ” as indicating sysmiss (. If some parts of your composite variable are numeric characters that should be Re: st: RE: find-replace in stata From: "Dalhia Mani" < [email protected]> st: IVTOBIT with 2 PROBITS on first stage From: "Diana Fletschner" < [email protected]> Diagnostics subinstr(s, old, new, cnt) and subinword(s, old, new, cnt) treat cnt < 0 as if cnt = 0 was specified; the original string s is returned. Shaunson, David T. While there is no formal standardization of the syntax for a regular expression, there is a general consensus on the basic elements of the syntax. This lecture series is intended for economics, management Description destring converts variables in varlist from string to numeric. )) but now I'm getting The substr function requires a string as its first argument. The substr() function takes three arguments: the string to act on, the starting point of the substring to extract, and the number of characters to extract. The child ID has an "A" suffix at the end of a series of integers but the parent ID has matching integers only. The most > crucial detail is the lack of an > equals sign to force evaluation. . j. > > foreach var of varlist data* { > local newname = substr (`var', 5, . Sergiy has already given you one solution: as I mentioned, reversing the string first was the previous trick. (missing), the remaining portion of the Unicode string is returned. Oct 17, 2022 · Useful string functions in Stata (updated list) Most often when I search the internet for help on Stata, it is probably when I need to work with string variables (such as names). Example below. I couldn’t use regular expressions because the strings I’m working with happen to contain regexp control characters. Four of these reasons are listed below. I only wish to remove the last character if it is "A": We use the substr() function to extract pieces of the string and use the real() function, when appropriate, to translate the piece into a number. Jones” are examples of strings. For an extended discussion of numeric and string data types and how to convert from one kind to another, see Cox (2002). For example, I have a variable of jobtitle and the observations can vary "CEO" "Chief Executive Officer" "President" "President & CEO" "President & Chief Executive Officer" "Chairman" "CFO" "Chief Remarks and examples stata. Note that occurrences must be disjoint (non-overlapping): thus there are two Aug 5, 2016 · Step 1. References: st: extract string portion From: thomas bourveau <thomas. The final string should look like this: ahuetlmltoing Any ideas how this could be done? I used subinstr (s1,s2,s3,n) to match characters but this always replaces the first or more instances of the character and it is problematic. edu/stat/stata/ Jul 14, 2016 · Dear all, I have a dataset which contain id number with the display format is %6. cox@durham. How do I create two variables, one named Last_name, the other First_name? Variable Las Aug 2, 2016 · I am just interested, is there a way to have a check like this, but from among any of the observations of a variable, not only direct matches. )) but now I'm getting Jun 15, 2017 · It greatly simplifies the process of replicating your Stata example in another person's Stata, so that code can be tested on it. com> Prev by Date: Re: st: Bootstrapped Standard Errors Next by Date: Re: st: save a subset of data Previous by thread: Re: st: Re: finding a word within a string variable in Nov 2, 2018 · However, in Stata, the - strpos () - function can only return the position in string at which its substring is first found. ) and interprets Bersant, have a look at -help string functions-. substr() may be used with text or binary strings. com> Re: st: indicator for "if cell contains the word or phrase" From: Nick Cox <njcoxstata@gmail. 1 41 commands Putting aside the statistical commands that might particularly interest you, here are 41 commands that everyone should know: Nov 27, 2016 · Dear all I want to substitute every second character of a string (e. E. 27. split("-")[0]; in above code split method returns array of stings, which is separated by '-' character. Thank you. so here we are getting 0 index string separated by - character . Aug 10, 2016 · Your code and indeed your question are a little hard to follow. 24. Both of these functions are variadic. One frequent context is whenever various possible answers to a question are bundled together in values of a string variable. com Stata understands strlen() as a synonym for its own length() function, so you can use the function named strlen() in both your Stata and Mata code. Regular expression is a method that allows for systematic searching, matching and replacing within strings using operators and letters. uk Skipper Seabold I'm trying to use reshape with a string variable, but my string variable contains special characters. See help string functions in Stata 14 for documentation of strrpos(). References: st: Re: finding a word within a string variable in Stata 12 From: Nick Cox <njcoxstata@gmail. stata. stata. Description substr(s, b, l) returns the substring of ASCII string s starting at position b and continuing for a length of l characters. In particular, strings may contain binary 0. 6 substr () Area codes are exactly three digits long, so another easy method is to just extract the first three characters of the phone number. , this page). The help explains: =================== noccur (strvar) , string (substr) creates a variable containing the number of occurrences of the string substr in string variable strvar. Besides applying the commands below to data, you also may want to apply the same commands to STATA macros 1 The problem: Looking for words Searching for particular text within strings is a common data management problem. The authors of the guide can happily reveal that they have applied this a lot when working with ICD codes (classification system for diagnoses). Regular expressions are simply strings that are a mix Description Conformability Diagnostics Also see substr(s, tosub, pos) substitutes tosub into s at byte position pos. storage display value variable name type format label variable label In Stata, I needed to search some string values. My string data is the following: Remarks and examples An invalid UTF-8 sequence in s, old, or new is replaced with the Unicode replacement character \ufffd before replacement is performed. a specific character) in a string. bourveau@gmail. 6. Then same advice as above. Then you can get required sub String by its index. 1, -dataex- is part of your official Stata installation. Variables in varlist that are already numeric will not be changed. They can include both strings you wish to match exactly, and more flexible descriptions of what to look for. Step 3. could be extended in a copy of his program, e. com> Prev by Date: st: extract string portion Next by Date: Re: st: extract string portion Previous by thread: st: extract string portion Next by thread: Re: st: extract string portion Index (es): Description The above functions are for manipulating strings. 1 Description The word string is shorthand for a string of characters. There are some very good summaries that cover aspects of string variables (e. But there are -egen- functions -noccur ()- and -nss ()- in -egenmore- from SSC. So I have since tried gen year= (substr (string (fiscal_year_ended),-4,. If you copy and paste into the Data Editor, say, under Windows by using the clipboard, but data are space-separated, what you regard as separate variables will be combined because the Data Editor expects comma- or tab-separated data. If anyone has any suggestions regarding this issue, please let me know!. In the first segment, did you really type all or was it _all? Either way, that code will indeed fail if it meets a string variable. com When working with binary strings, one can find the first or last location of the binary 0 using strpos(s, char(0)) or strrpos(s, char(0)). How do you find the right one? Read help string functions. Sep 30, 2022 · Find a specific word in a string 30 Sep 2022, 13:44 Hi all, I am trying to find a specific word in a string. If b + l describes a position to the right of the end of the string, results are as if a smaller value for l were specified. Mar 7, 2016 · I find similar problem but starting from a numeric variable when using the string () function to make it string I already get the "unrecognized command" message. That function requires 3 arguments, which also include the beginning position of the substring and how long it is. Either way, run -help dataex- to read the simple instructions for using it. In other words, to be able to go line by line and take a portion of a string and look across all observations in the other variable to check whether that partial string is contained within any of the observations of the other variable. Description Conformability Diagnostics Also see substr(s, tosub, pos) substitutes tosub into s at byte position pos. split can be useful when input to Stata is somehow misread as one string variable. I have tried several tricks but so far I have been unable to find a clean and effective fix for this problem. You probably need something like -strmatch()-. acustomstring) with a character from another string (hello). Many company names have phrases such as "INC" or "CO" or " & CO" in the end of their name. Previous by thread: st: Substring extraction based on punctuation Next by thread: Re: Re: st: Permutations and logistic regression (Stata 8) Index (es): Date Thread Remarks and examples stata. Jul 2, 2015 · strrpos () is part of the built-in official code in Stata 14 and cannot be installed from anywhere. The substr() function takes three aarguments: the string to act on, the starting point of the substring to extract, and the number of characters to Nov 16, 2022 · How do I count the number of distinct strings across a set of variables? Aug 24, 2016 · Additionally, I have found that Stata is dropping the first letter of some names, even if that observation doesn't have any special characters within its name. cgi?search * http://www. What I need to do now is to extract part of the numeric values based on a rule. In substr(s, b, l) and substr(s, b), if b describes a position before the beginning of the string or after the end, "" is returned. Oct 20, 2016 · Here is a solution using regular expressions which in this case I find simpler than string functions. Use ustrpso() or ustrrpos() to search based on characters rather than on bytes. e Bachelor of Apr 7, 2021 · I'm looking to extract the last four digits of a date formated as 07apr2021 to create a new variable, so right now i'm using gen year=substr (fiscal_year_ended,-4,. Description substr(s, tosub, pos) substitutes tosub into s at byte position pos. If varlist is not specified, destring will attempt to convert all variables in the dataset from string to numeric. ) which I think would work if I had only numerical/string values, but with a combination of both I'm for sure confusing the system. A period (. g. com/support/statalist/faq * http://www. 3f. Further, how to count the number of characters in the string variable or count the Jul 20, 2021 · I am using Stata 17 and have ran into a data problem. replace <varname> = <exp> if strmatch(<strvar>, "*GHMB*") (although I guess you are looking for "GmbH" instead of "GHMB") Better advice requires more information abut what _exactly_ you typed and what _exactly_ Stata replied, as stated in the FAQ (which you are Remarks and examples Stata understands length() as a synonym for its strlen() function. And I would like to use substring command to create a new variable take the Jul 16, 2020 · This page shows examples of how one might use string related commands in STATA. Stata has a function -substr- substr (s,n1,n2) returns the substring of s starting at n1 for a length of n2. destring treats both empty strings “ ” and “. . Also see Purpose obtain tokens (words) from string concatenate string vector into string scalar pattern matching advanced parsing length of string width of % fmt find substring within string find character not in list stata. For example, I need to chang If you need to subtract a portion (substring) from a string variable, you can use substr. If not, run -ssc install dataex- to get it. We will show some examples of how to use regular expression to extract and/or replace a portion of a string variable using these three functions Jun 4, 2015 · How to find particular word in string in stata 04 Jun 2015, 11:20 Hello together, Is there a command in Stata which to search in string variable for a particular word and to return only this word. You want whatever lies between position 1 and just before the dash. So I have to replace original string variable and identify position of punctuation ("、") many times and that make my codes very complicated and bloated. For instance, for a value of 1001100, I need to extract the last three digits (100); for a value of 1010110, I need to extract the last two digit (10); for a value of 1011000, I need to extract the last Mar 3, 2022 · I have a variable in Stata in my dataset that looks like this: city Washington city Boston city El Paso city Nashville-Davidson metropolitan government (balance) Lexington-Fayette urban county And I In this video, we discuss how to extract specific text from a string variable using substr and the word function. Nov 16, 2022 · You can check whether a given variable has ICD-9-CM diagnosis codes, ICD-9-CM procedure codes, or ICD-10 diagnosis codes by using, respectively, the icd9, icd9p, or icd10 command with the generate subcommand and range () option. Michael's condition if real (substr (`varlist',`i',1)<. Variables containing strings—called string variables—occur in data for a variety of reasons. Stata has a function, subinstr(), that looks for occurrences of substrings within strings and replaces them with a specified substring (often just an empty string, ""). Remarks and examples stata. Frank -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of TEWODAJ MOGUES Sent: Tuesday, September 13, 2005 4:47 PM To: Stata _ Subject: st: Replace a substring Hi, I am hoping that this is quick and simple to answer. Jan 23, 2014 · I am trying to create a do file to import a bunch of these files into Stata and need a reliable method to remove the www. Do not, however, use length() in Mata when you mean strlen(). Additionally, your varlist syntax unemp* will not catch the variables named div_unemp##, since they do not begin with unemp (generating the "type mismatch" error). If the second argument is a 1, and then if the first character is numeric, the returned name is prefixed with an underscore character. It is this core syntax that Stata implements in its regular-expression functions. ats. If you are running version 15. Find the dash. Nick n. How to use regexr or ustrregexra to replace all special characters? Feb 24, 2023 · I have a set of medication descriptors in Stata that I want to standardize. For example: > if newvar (i)=1453209 > then gen state (i)=substr (newvar,5,7) will generate state (i)=09 The main idea is fine, but a few details are wrong here. of 2 as a word have been replaced with 3 the substring of , starting at 1, for a length of 2 escaped decimal or hex digit strings of up to 200 bytes of the Unicode character corresponding to Unicode code point or an empty string if is beyond the Unicode code-point range the number of display columns needed to display the Unicode string in the Stata Results window the Unicode substring of Mar 10, 2015 · I have observations which list criminal codes as string variables, but not in the format I need. The second variable, defendant, is (nearly) the rest: References: st: indicator for "if cell contains the word or phrase" From: Shehzad Ali <drshehzad_ali@yahoo. com/help. This can be done with substr() (substring). ) as length means "keep right on to the end of the string". If so, remove them. Strings in Mata are strings of Unicode characters in UTF-8 encoding, usually the printable characters, but Mata enforces no such restriction. Step 2. The alternative to strings is numbers—0, 1, 2, 5. ucla. ", substr (`varlist',`i',1)) That is, the first part of the argument to -index ()- is a list of allowed characters. The (reproducible) example below shows both corrections. Hi, I am trying to take the first two characters of a string variable using substr command as below: name2 = substr (name,1,2) However I get an error message of " type mismatch". Thus: String processing is fairly easy in Stata because of the many built-in string functions. by | index ("-. ) > rename `var' `newname' > } > > Another way to do it is > > foreach var of varlist data* { > local newname : subinstr local var "data" "" > rename `var' `newname' > } > > In general, variable Matching and searching regexm (); regexr (); regexs () These are the three functions that use regular expressions to perform matching. ac. I want to extract the name of the drug that is found in the first word or two of the string. I want to remove all such characters from the end of the company name. Mata’s length() function returns the length (number of elements) of a vector. dgdickcyyulbfzsoleptuvrjzyacarlvdwumseqzexhoywxshurbhjbdgvbyvzbabnhfncgmjjyohc