A regular expression to match C-style string literals
I want to match all C-style string literals in a file:foo("Something went wrong", "another one")bar("This has an escaped \\ \"")baz("Let's go mad: \\ \" \\\\\\\\\"")Must match 4 times giving all those...
View Article"length($d) == $s && $d =~ /^.{$s}$/" fails
Reading from shared memory, Perl treats the data as tainted, so I wrote a function that will untaint the data unconditionally (as I control the data being written to).As it failed sometimes, I also...
View ArticleGet spaces count between nearest non-space character and given index
I have a string: ONT ONT ONT Auto-neg Speed Duplex Port Flow Native PriorityAnd i need to get Auto-neg from it (for example).I have start index of this word, for example 24.I need to get space count...
View ArticleIs /[\s\S]/ the same as saying /.|\n/ in regex
I assumed in regex that saying:/[\s\S]/means the same as saying:/.|\n/But then I discovered that in JavaScript the line separator <0x2028> and the paragraph separator <0x2029> do not match...
View ArticleHow many backslashes are needed to escape characters in grep?
I'm a little confused about how many backslashes are needed to escape the alternation operator | in regular expressions for grep. Thisecho abcdef | grep -e"def|zzz"outputs nothing, because grep is not...
View ArticleRemove characters from beginning and end or only end of line
I want to remove some symbols from a string using a regular expression, for example:== (that occur both at the beginning and at the end of a line),* (at the beginning of a line ONLY).def some_func():...
View ArticleRuby Email validation with regex
I have a large list of emails I am running through. A lot of the emails have typos. I am trying to build a string that will check valid emails. this is what I have for regex.def...
View ArticleUsing a regex as a template with Python
I have the idea to use a regex pattern as a template and wonder if there is a convenient way to do so in Python (3 or newer).import repattern =...
View ArticleSearching for multiple matches on one line using Grep and Regex
I'm trying to use Grep with wc -l to print out the number of words in a text file that have 3 or more vowels in a row.Right now, I'm inputting:grep -i -E '<\.*[aeiou]{3}.*\>' file.txt | wc -lbut...
View ArticleWhat regular expression captures most homophones related to the English words...
These strings of text are associated with the same sounds when spoken aloud:twotootoThe following is a valid regular expression.However, the following us not a very good solution, because only four...
View ArticleWhat is a popular language used to generate regular expressions? [closed]
The syntax for regular expressions is very challenging for me to read, write, and understand.For example, it is very difficult for me to remember that an asterisk * has the same meaning as "zero or...
View ArticleWhat is the optimized regex to match the email pattern in java
I am using the below regex in my program for matching the email pattern which is working fine.Pattern :...
View ArticleHow do I match any character across multiple lines in a regular expression?
For example, this regex(.*)<FooBar>will match:abcde<FooBar>But how do I get it to match across multiple lines?abcdefghij<FooBar>
View ArticleGetting Initials from a name in R
I'm sure there's a more eloquent way:NAMES <- data.frame(ID = "George Washington")NAMES$ID <- as.character(NAMES$ID)gsub("", "", paste(substr(data.frame(strsplit(NAMES$ID, ""))[[1]], 1, 1),...
View ArticleWhat is the \& pattern in Vim's Regex
I recently came across the branch specifier in Vim regex builtins. Vim's help section on \& contains this:A branch is one or more concats, separated by "\&". It matches the lastconcat, but only...
View ArticleExtra non-character or empty character or absence is getting printed at the...
Consider the following codeString regex = "((\\d\\d\\d\\d)(\\w\\w\\w)(\\W\\W))*";String targetString = "$()1287jga$%dp5000tag%!5000tag%!5000tag%!q1";Pattern pattern = Pattern.compile(regex);Matcher...
View ArticleWhere can I find unit tests for regular expressions in multiple languages?
I'm building a regex helper at http://www.debuggex.com. The amount of detail I want to show requires me to write my own parser and matcher.To make sure my parser and matcher work correctly, I've...
View ArticlereplaceAll error [duplicate]
This is my regex. I want to find the opening and closing parentheses and replace them with "\(" and "\)".word = word.replaceAll(Pattern.quote("("), "\\"+"(").replaceAll(Pattern.quote(")"),...
View ArticleRegex str_replace
Would it be possible to incorporate a str_replace method with a regular expression, designed to catch url strings in a simple html < textfield > input type?I'm considering something simple like a...
View ArticleLine's number using regex in Notepad++?
Is it possible to get the line's number using regex in Notepad++; what I want to do, is replacing:line1line2line3etc..with1-line12-line23-line3etc..
View ArticlePhp regexp get the strings from array print_r like string
I'm trying to list out here how to match strings that looks like array printr.variable_data[0][var_name]I would like to get from above example 3 strings, variable_data, 0 and var_name.That above...
View Articlepreg_match not capturing obvious match [closed]
I'm at an utter bottleneck because of this issue. I'm sure I'm probably making some extremely simple mistake, but I have no idea what it could be.I have a variable $html, which contains a string of...
View ArticleRegEx to extract a name after a string is found in a string
I am trying to check if a string is in a string using RegEx in a AutoHotKey script.If my string is a file path like this:G:\htdocs\projects\webdevapp\app\folder\file.phpThen I need to extract the...
View ArticleHow to exclude images from regex email extraction
I am using some email extractor software to (surprise surprise) extract emails from websites. It uses the regex: [A-Z0-9._%+-]+@[A-Z0-9.-]{3,65}\.[A-Z]{2,4}But this churns out images as well as emails...
View ArticleWhy telegram emoji numbers are not deleted when removing special characters
I have a telegram bot and I want to remove all special characters and just returns numbers and A-Z,but the problem is that my regex pattern can remove any emojies except numbers like this...
View ArticleRegex to remove ANSI escape sequences from script output
I'm trying to write a regex to remove all that starts with '[' and ends with 'm' or ';' so that the following script will be purged of all its special chars:Script started on 2023-09-16 10:06:45-04:00...
View ArticleUse a regex to get text from html source code
I have got a php code that stores html source code of a site in a variable and I want to get two links from that source code only.First link is in meta tag key content:<meta property="og:image"...
View ArticleHow do I combine 2 instances of java.util.regex.Pattern? [closed]
I have 2 different instances of java.util.regex.Pattern. How do I combine them so that both apply?My use-case is that I am building a search tool, and I am giving users the ability to add all sorts of...
View ArticleSome capture groups seem lost when matching group repeatedly
Trying to parse the output of monitoring plugins I ran into a problem where the match result was unexpected by me:First consider this debugger session with Perl 5.18.2: DB<6> x $_0...
View ArticleRegex character repeats n or more times in line with grep
I need to find the regex expression to find a character that repeats 4 or more times with grep.I know that the expression is {n,}, so if I need to find lines, for example, when the character "g"...
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