Regexp tcl help. string equal compares strings literally, but string match matches interprets a pattern expression and matches a string against that. So i have created following example: set text "Gi Gi Gi Tw Tw Tw Tw Tw Tw Tw Tw Tw Tw Twe Jul 6, 2020 · lsearch searches for elements in a list that match a pattern. com please" regexp -expanded { \y # word boundary [^@\s Feb 23, 2016 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, The tables below are a reference to basic regex. Sep 23, 2021 · When -regexp is specified, the BOOST syntax is now used, not the regular Tcl regexp syntax described in re_syntax help, and mentioned in (UG835) v2016. 6 days ago · Tcl is a high level open source tool command language. Regular expressions provide a very powerful method of defining a pattern, but they are a bit awkward to understand and to use properly. , HCLS::quote::regexp. I encourage you to print the tables so you have a cheat sheet on your desk for quick reference. 00h_2ru. 099B_0. Dec 23, 2022 · i am working with the regexp command in TCL to get the amount of times, some string occurs in a list. ) regsub, a built-in Tcl command, performs substitutions based on regular expression pattern matching. info lots of general information, and a thorough tutorial Jul 30, 2010 · hi everybody i want solution for this regular expression, my problem is Extract all the hex numbers in the form H'xxxx, i used this regexp but i didn't get all hexvalues only i get one number, how REGULAR EXPRESSION SYNTAX Tcl regular expressions are implemented using the package written by Henry Spencer, based on the 1003. So might regular expressions. ) Tcl also supports string operations known as regular expressions Several commands can access these methods with a -regexp argument, see the man pages for which commands support regular expressions. This helps to match a character in TCL. 2 spec and some (not quite all) of the Perl5 extensions (thanks, Henry!). Regular expressions are generally The argument following this one will be treated as exp even if it starts with a -. Regular expressions are used in the regexp, regsub commands, and optionally in lsearch and switch. gz abc1_vv24_0. gz I want to separate like below in single command for abc1 vv24 0. Example : We may write the format for document file as – “docx?” The ‘?’ tells the computer that x may or may not be present in the DESCRIPTION Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it does not, unless -inline is specified (see below). Regexp help - The Tcl programming language - Tcl/ Tcl/Tk, and Expect ; forum discussion Dec 6, 2012 · How to combine all the patterns in one regexp command? Is there a way for it? Example: If my variable is "a" and if I need to check "a" for more than 1 pattern, how to do this in a single command? Learn tcl - MatchingThe regexp command is used to match a regular expression against a string. The (?letters) syntax is the same, but the available mode letters and their meanings are quite different. These help us to find a particular character and then we can use our ways to deal with it. See the manual entry for regexp for details on the interpretation of regular expressions. Apr 3, 2025 · Tcl lsearch command tutorial shows how to search lists in Tcl. When you want to match the last occurrence of . Oct 27, 2024 · Regular expressions in TCL provide a versatile way to manage pattern matching and text processing. ) I'm trying to figure out how to use a string in a regexp match. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Apr 12, 2024 · Example : The Regular expression . Here is the code: I am trying to find the pattern " Dec 6, 2021 · I'm guessing your problem is that regular expressions are matched greedily, so they stop matching as late as possible. If varName is supplied, the command returns a count of the number of matching ranges that were found and replaced, otherwise the string after replacement is returned. * will tell the computer that any character can be used any number of times. # there is no guarantee that this regex will properly match e-mail addresses. Apr 3, 2025 · Tcl regexp command tutorial shows how to use regular expressions in Tcl. This flavor is dubbed “Advanced Regular Expressions”, to indicate it is a step up from POSIX Extended Regular Expressions, which Tcl also supports. % set line "set_load 10 serdes[10]" invalid command name "10" You need to escape them or use braces which don't allow command substitition within: % set line "set_load 10 serdes\[10]" set_load 10 serdes[10] % set line {set_load 10 serdes[10]} set_load 10 serdes[10] This output is from an Nov 20, 2014 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Jun 11, 2025 · The Vivado Design Suite offers multiple ways to select a subset of objects with the get_* commands, using the -filter and/or -regexp options with the -hierarchical option. string map accepts a list of simple string substitutions and a string to modify. This works: #!/usr/bin/expect set MYSTR "value" Only one of TCL_REG_EXTENDED, TCL_REG_ADVANCED, TCL_REG_BASIC, and TCL_REG_QUOTE may be specified. While reading the rest of the site, when in doubt, you can always come back and look here. Synopsis lsearch ? option? list pattern Options MATCHING STYLE OPTIONS -exact pattern is a value to match exactly. *, +, and ? are all known as quantifiers, respectively meaning "0 or more", "1 or more", and "0 or 1" repetitions of the preceding atom (character). Apr 17, 2017 · I need help with tcl regexp. Nov 5, 2018 · Since brackets are Tcl's command substitution syntax, you can't put them in double quotes unescaped. If this is specified with match variables, they will contain information for the last match only. " atoms (match anything) instead of "\. tar. Optional character ( ? ) This symbol tells the computer that the preceding character may or may not be present in the string to be matched. RegexBuddy makes it very easy to work with the regexp This topic is not intended to discuss regular expressions themselves. where : hercurly braceDocumentation RegSub ReferenceDocumentation RegExp ReferenceTcl Regular Expression Jun 16, 2014 · Code usually gets exponentially harder to understand as regular expressions get more complicated. ) Hello, Google didn’t help me too much I would like to know if there is a online regular expression tester like this https://regex101. Aug 6, 2017 · DESCRIPTION Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it does not, unless -inline is specified (see below). Both search <patterns> and -filter expressions must be written as regular expressions when this argument is used. There are many resources on the internet explaining regular expressions and tools to help build regular expressions. The code below comes from Hume Smith 's HCLS package. Useful for searches involving * -glob -regexp pattern is a regular expression -sorted requires the list to be sorted, and does faster binary search. Much of the description of regular expressions below is copied verbatim from his manual entry. To see what the entire match is, ignore the parentheses: the pattern is now {\w\w}, matching the two first word characters in the string (in). Synopsis string match ?-nocase? pattern string Description Determine whether pattern matches string, returning return 1 if it does, 0 if it doesn't. For instance, file has some lines of code containing 'major'. (It you want a bookmark, here's a direct link to the regex reference tables). Sep 4, 2002 · But for simple string substitutions like this, that don't take advantage of wildcards or other pattern-matching features of regular expressions, it's much simpler to use the Tcl string map command. For Dec 25, 2015 · In your code, the regexp is returning the value 1 only, not 0. I have been searching on google for an hour, figured i would just ask the experts. So let us examine some more examples in detail. Only one of TCL_REG_EXTENDED, TCL_REG_ADVANCED, TCL_REG_BASIC, and TCL_REG_QUOTE may be specified. For example I have Jun 20, 2015 · I am writing a code to grep a regular expression pattern from a file, and output that regular expression and the number of times it has occured. DESCRIPTION Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it does not, unless -inline is specified (see below). , you have to go ahead with sub-matches to get what you want. Dec 9, 2020 · Regular expressions in TCL are a way to search text. This topic will try to cover the common switches and methods of using regular expressions in Tcl and some of the differences between Tcl and other regular expression engines. Mar 9, 2017 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Regular expression or Regex has been invented in the 50`s and been around since the 60's and it can be found in most high level programming languages and so TCL is no exception. 1 now handles advanced regular expressions (REs). doe. Jun 16, 2025 · Arguments -regexp - (Optional) Specifies that the search <patterns> are written as regular expressions. I have 1 variable set a "mau_gigabitethernet0/0/cpu0/2" with the help of regexp I need to fetch the 0/0/CPU0 I'm getting an error, “invalid escape \\ sequence” can anyone help Tcl regular expressions are implemented using the package written by Henry Spencer, based on the 1003. regsub A companion command to [regexp] that in addition to matching, performs substitutions. Tcl_RegExpExecObj executes the regular expression pattern matcher. In Tcl, these last two match a backspace and a backslash, respectively. Xilinx regular expression Tcl commands are always anchored to the start of the search string. Perl and most other modern regex flavors use \b and \B. If you don't know the difference between greedy and lazy, this program will explain that. ) Causes the regular expression to be matched as many times as possible in the string, returning the total number of matches found. Generally, this is a module that many programmers feel really strongly about be it negative or positive for multiple reasons but mostly because this is a Oct 23, 2025 · The "regexp-limit" setting: Limit the size of the bytecode used to implement a regular expression to this many steps. Out of all these lines I need to identif Jun 1, 2018 · What have you tried? Have you googled and found any results that might help you? I quickly googled for "tcl string split" and "tcl string trim" -- the results may be a starting point. com Oct 29, 2025 · Tcl uses \m, \M, \y and \Y for word boundaries. See Also Regular Expressions describes Tcl's regular expressions (advanced regular expressions) The Open Group Base Specifications Issue 7, Regular Expressions , AKA POSIX regularexpressions. Here are two solutions to illustrate this - the first uses { through } to defer the regular expression so that any \ characters in it do NOT ned further protection from the Tcl interpretter; the second uses " through " to group the regular expression and in this case the \ does need extra protection. g. Learn lsearch with practical examples. The first submatch is what you get if you skip one word character (the Feb 22, 2020 · I got regexbuddy. ). Try the pattern "(. # This is a very simplistic e-mail matcher. In particular, to a first approximation it is the case that the first quantifier in a string sets the greediness for the whole RE. See Cameron Laird's Personal Notes on Regular Expressions . May 16, 2017 · In a regular expression, * means "zero or more of the previously specified character or class". the. If -nocase is specified, then the pattern attempts to match against the string in a case insensitive manner. In regular expressions, * does not mean "a string of any characters," as is the case in glob -style usages. 099B 0 DESCRIPTION Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it does not, unless -inline is specified (see below). 1, April 6, 2016. It does understand tcl plus 10 or so others like java, perl, python, posix, etc. May 16, 2012 · I have a problem. Note that Nov 23, 2019 · A regular expression defines a pattern in text. It has a very nice help function that explains regexes in great detail and worth the price alone, IMO. (Regular expression matching is described in the re_syntax reference page. ) Say us exactly, what you want to match and/or extract with a regular expression. Sep 3, 2014 · In Tcl, if you type a string using "" for enclosing it, everything inside will be evaluated first and then used as a string. The "regexp" command is used to match a regular expression in Tcl. Documentation re_syntax The official reference manual for Tcl regular expression syntax But since you only care about the string up to the first "hello", and not the "hello" itself, you can refine the regexp a little (and remove the need for submatches) using a positive lookahead: Tcl 8. '' (matching any single character), ``^'' (matching the null string at the beginning of the input string), ``$'' (matching the null string at the end of the input string), a ``\'' followed by a single character (matching that Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it doesn't, unless -inline is specified (see below). They may not look like this to you - but they follow (many) rules, indeed. '' (matching any single character), ``^'' (matching the null string at the beginning of the input string), ``$'' (matching the null string at the end of the input string), a ``\'' followed by a single character (matching that Aug 31, 2012 · Possible Duplicate: How to use a variable in regexp expression (TCL/Expect) I want help in passing varibles to a regexp. I am reading a file and printing the lines which are not in a list. It also serves as both a library of useful expressions to include in your own code. This greatly increases readability, and the readability of regular expressions needs all the help it can get. ) Aug 5, 2010 · See Also Regular Expression About regular expressions in general. Jun 16, 2021 · Arguments -regexp - (Optional) Specifies that the search <patterns> are written as regular expressions. Tcl also takes a completely different approach to mode modifiers. Regex is used to find/replace matches or NOT matches in strings. Tcl_RegExpMatch determines whether its pattern argument matches regexp, where regexp is interpreted as a regular expression using the same rules as for the regexp Tcl command. e. ) NAME Tcl_RegExpMatch, Tcl_RegExpCompile, Tcl_RegExpExec, Tcl_RegExpRange, Tcl_GetRegExpFromObj, Tcl_RegExpMatchObj, Tcl_RegExpExecObj, Tcl_RegExpGetInfo - Pattern matching with regular expressions An atom is a regular expression in parentheses (matching a match for the regular expression), a range (see below), ``. Learn regexp with practical examples. glob Bugs Tcl also supports string operations known as regular expressions Several commands can access these methods with a -regexp argument, see the man pages for which commands support regular expressions. *?)" instead. Jan 8, 2022 · In this article we are going to discuss about various string operations in TCL regular expressions such as find and replace method, regular expression wildcard matching, regular expression group matching, and match status regular expression, replace and match count. Could please help me with them. 23rd@no. Xilinx® regular expression Tcl commands are always anchored to the start of the search string. # e-mail addresses are extremely complicated to match properly. ) Learn how to correctly use variables in regular expressions, including handling special characters like ". Suppose I have a file name as abc1_vv24_0. NET, Rust. Online testing for tcl (regexp command) regular expressions. Jul 11, 2012 · I am trying to write a Tcl script in which I need to match a variable in a regular expression. GENERAL MODIFIER OPTIONS -all returns the indices of all matches, or Oct 13, 2017 · Note that the variable had better contain a valid regular expression fragment, and we need to double up the backslash (because we're in a double-quoted context and not a braced context; one backslash is for the basic Tcl language, and the other is for the RE engine). such. 正規表示式（Regular expression，regex、regexp、RE），又稱正規表達式、正規表示法、規則運算式，用簡單字串來描述、符合文中全部符合指定格式的字串，現在很多文字編輯器都支援用正規表達式搜尋、取代符合指定格式的字串。 語法參考來源 線上練習tcl 線上練習tcl2 Jun 8, 2022 · I am new to TCL world and i was using regexp in my code. It returns 1 if objPtr contains a range of characters that match regexp, 0 if no match is found, and -1 if an error occurs. Tcl 8. It consists of multiple rules and the following table explains these rules and corresponding use. It provides a set of commands for this purpose, e. Below are the few matching expressions. See full list on tutorialspoint. By mastering `regexp` and `regsub`, you can simplify tasks such as data validation, substring Jun 23, 2002 · Regular Expression Examples is a list, roughly sorted by complexity, of regular expression examples. Previous regular expression handling is almost unchanged except that clumsy handling of escapes like \n has been much improved, and a few escapes that were previously legal (but useless) now won't work. May 18, 2016 · This regular expression finds lines that end with the digit 1 in a word by itself (i. {k}. “regexp” represents the regular expression. A regular expression is a sequence of characters that contains a search pattern. Regular Expressions About Tcl regular expressions. " in matching patterns. Mar 17, 2025 · Tcl_RegExpMatch determines whether its pattern argument matches regexp, where regexp is interpreted as a regular expression using the same rules as for the regexp Tcl command. If the job can be done with a straight match and an if command, that's always better than arcane regular expressions. Tcl regular expressions are implemented using the package written by Henry Spencer, based on the 1003. Oct 10, 2025 · The "regexp-limit" setting: Limit the size of the bytecode used to implement a regular expression to this many steps. com but for Tcl Thanks Nicolas Apr 15, 2025 · Tclers wikiCommands like regexp, glob and others make use of special characters which need to be escaped if you want the argument to be treated as a literal string. See Also regular expressions information about Tcl regular expressions that is not unique to any particular command string map subst Synopsis regsub ? switches? exp string subSpec ? varName? Documentation official reference Description regsub matches string against the regular expression exp Only one of TCL_REG_EXTENDED, TCL_REG_ADVANCED, TCL_REG_BASIC, and TCL_REG_QUOTE may be specified. I was trying the below code but it is not Dec 22, 2014 · In Tcl, double quotes allow a first level of substitution. glob Bugs The regular expression (exp) in the two regular expression parsing commands is evaluated by the Tcl parser during the Tcl substitution phase. Maybe some of these links how to deal with regular expressions in Tcl help you a little bit: Jan 24, 2017 · Regexp to match specific characters in tcl Asked 8 years, 6 months ago Modified 8 years, 6 months ago Viewed 3k times Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it doesn't. Tcl_RegExpMatch, Tcl_RegExpCompile, Tcl_RegExpExec, Tcl_RegExpRange, Tcl_GetRegExpFromObj, Tcl_RegExpMatchObj, Tcl_GetRegExpInfo - Pattern matching with regular expressions The "regexp" command is used to match a regular expression in Tcl. 6. So you are looking for any string with zero or more numerical characters. It is important to limit this to avoid possible DoS attacks. It is only when that level of substitution completes, that the result is passed to the regexp function. " atoms (match The regular expression in TCL: - Match a regular expression against a string - Perform substitutions based on regular expression pattern matching The regexp command has as syntax: The character ? say that the parameter is optional. Tcl’s built-in regexp and regsub commands provide excellent support for regular expressions, with a modern and complete regex flavor. set mydata "send mail to john. Nov 23, 2019 · Tcl regular expressions or Advanced Regular Expressions, implemented by Henry Spencer, are described below. The purpose is to describe a string pattern to match with - for searching, extracting, or replacing substrings. This means that \s is evaluated (interpreted) as an escape character, instead of two characters. there are no digits or word characters preceding it). Suppose my code is set line "MPID:22 condition:AIS" set id 22 if {[re Another language (I wouldn't want to call it "little") embedded inside Tcl is regular expressions. string match switch -indexvar and -matchvar can be used to capture both matched substrings and their indices in one operation. This can provide a great deal of power, and also requires a great deal of care. Documentation: close, fileutil package, gets, if, lindex, open, package, puts, Syntax of Tcl regular expressions, regexp, while Mar 17, 2013 · How to write a regexp in TCL that matches word and whitespaces. Sep 14, 2011 · The impression I got from perusing Mastering Regular Expressions, ed 2, is that catastrophic backtracking is not a problem in Tcl, due to the implementation of the regex engine. :^) In the process I corrected a subtle bug: the Tcl interpreter was gobbling up all the backslashes and not passing any to the regexp command, and that meant regexp was getting ". Disambiguation "Regular Expressions" is the name of an at-least-monthly column on scripting languages CL has co-authored from 1998 to 2009. Determines whether the regular expression exp matches part or all of string and returns 1 if it does, 0 if it doesn't, unless -inline is specified (see below). Aug 5, 2010 · See Also Regular Expression About regular expressions in general. (Is there license information for the original code?) - TWu 2025-04-15: No, none found and no contact Aug 1, 2014 · If -inline but not -all is not given, regexp returns a list consisting of one value for the entire region matched and one value for each submatch (regions captured by parentheses). This page is about regular expressions in general, not necessarily Tcl regular Expressions in Tcl. Jan 27, 2016 · The problem you've got is that Tcl's RE engine is automata-theoretic and doesn't cope very well with switching greediness modes. domain. An atom is a regular expression in parentheses (matching a match for the regular expression), a range (see below), ``. 8gd zqpy ukffq nmuc bgsm 13ii1 tr3 s6 17g8o c9ptv8n