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• Are regexes really maintainable?

  - by Rich Bradshaw

  Any code I've seen that uses Regexes tends to use them as a black box: Put in string Magic Regex Get out string This doesn't seem a particularly good idea to use in production code, as even a small change can often result in a completely different regex. Apart from cases where the standard is permanent and unchanging, are regexes the way to do things, or is it better to try different methods?

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• Validate HTML entities in JavaScript

  - by Eduard Luca

  I have a small JavaScript validation script that validates inputs based on Regex. I want to allow certain characters that are not exactly common (not sure if they're UTF8). For example I want to allow the following character ’, which looks like a single quote, but isn't. I got the HTML code for this which is &#8217;, but I'm not sure how to put this into the Regex. I've tried just inputting [&#8217]* but it doesn't validate.

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• Use regular expressions with Glib

  - by Sébastien

  Hello, I would like to find all comment blocks(/*...*/) but the function g_regex_match_full always returns true. Here is the code : // Create the regex. start_block_comment_regex = g_regex_new("/\*.*\*/", G_REGEX_OPTIMIZE, 0, &regex_error); //Search the regex; if(TRUE == g_regex_match_full(start_block_comment_regex, current_line, -1, 0, 0, &match_info, &regex_error)) { }

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• What is the best way to achieve `sscanf`-like functionality in perl?

  - by Alphaneo

  What is the best way to achieve sscanf-like functionality in perl? I am looking now looking at the sscanf module, Which is better, Option-1: Going sscanf way? Option-2: Regex way? [I am a beginner when it comes to Regex]

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• Scanning string in perl

  - by Alphaneo

  What is the best way to achieve sscanf like functionality in perl? I am looking now looking at the sscanf module, Which is better, Option-1: Going sscanf way? Option-2: Regex way? [I am a beginner when it comes to Regex]

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• regular expressions: ignoring certain chars globally

  - by shi kui

  Consider it that '_'s in a number doesn't change that number's value so 1000==1_000==10_00. The Problem: given numbers like 1_244_23 1412_2 1_1111 etc..., how could I decide whether certain number appears in that collection? For example: 1244_23 yes, 11_111 yes, 1412_1 no. How could using regex to solve this? I mean, if I could tell the regex engine just ignore these '_''s when matching then this problem becomes trivial? How could I do so?

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• Getting link using specific text

  - by jess

  Hi, From HTML body,I have to extract link which has text "Customer".For example <a href="google.com">Customer </a> I was thinking of using regex. What regex to use?

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• Regular Expression to parse SQL Structure

  - by user351429

  I am trying to parse the MySQL data types returned by "DESCRIBE [TABLE]". It returns strings like: int(11) float varchar(200) int(11) unsigned float(6,2) I've tried to do the job using regular expressions but it's not working. PHP CODE: $string = "int(11) numeric"; $regex = '/(\w+)\s*(\w+)/'; var_dump( preg_split($regex, $string) );

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• Replace all URL unless it is allowed

  - by ratamaster

  I had a regex that replaced all URLs from a given string: my_string = "www.example.com test www.mysite.com" my_string.gsub!(/[a-zA-Z0-9\-\.]+\.(com|net|de|org|uk|biz|info|co.uk|es|de)(\/\S*)?/i,'(site hidden)') As a result of the above I get: "(site hidden) test (site hidden)" How could I change the regex to not replace www.mysite.com ??? It means that the replace should output "(site hidden) test www.mysite.com" Thanks !

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• Find multiple line spanning text and replace using Powershell

  - by MrGrant

  Hello, I am using a regular expression search to match up and replace some text. The text can span multiple lines (may or may not have line breaks). Currently I have this: $regex = "\<\?php eval.*?\>" Get-ChildItem -exclude *.bak | Where-Object {$_.Attributes -ne "Directory"} |ForEach-Object { $text = [string]::Join("`n", (Get-Content $_)) $text -replace $RegEx ,"REPLACED"}

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• Regular expression (PCRE) for url matching

  - by zerkms

  The input: we get some plain text as input string and we have to highlighight all urls there with {url For some time i've used regex taken from http://flanders.co.nz/2009/11/08/a-good-url-regular-expression-repost/, which i modified several times, but it's built for another issue - to check whether the whole input string is an url or no. So, what regex do you use in such issues?

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• How to strip out all characters except for numbers, letters, quotes, and colons/semi-colons?

  - by evanmortland

  Hello, I have a document that I'm parsing text out of - I'm trying to figure out how to use this RegEx expression to take out everything that isn't alphanumeric, but I want to keep quotes, ampersands and colons/semi-colons. s = Regex.Replace(s, @"[^\w-]+", " "); How can I add a replace all of these "except these" pattern here? Thank you!

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• Substitute alt attribute with title attribute using sed

  - by hardc0de

  I have a PCRE regex that looks like this s/(<input.+?)alt(=".+?".*?>)/$1title$2/ Can anybody help me with making that work on sed? Eventually can anybody point me to some guide/blog post/whatever that explains differences between sed regex and PCRE?

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• .Net Removing all the first 0 of a string

  - by Melursus

  I got the following : 01.05.03 I need to convert that to 1.5.3 The problem is I cannot only trim the 0 because if I got : 01.05.10 I need to convert that to 1.5.10 So, what's the better way to solve that problem ? Regex ? If so, any regex example doing that ?

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• Ignoring certain chars globally

  - by shi kui

  Consider it that '_'s in a number doesn't change that number's value so 1000==1_000==10_00. The Problem: given numbers like 1_244_23 1412_2 1_1111 etc..., how could I decide whether certain number appears in that collection? For example: 1244_23 yes, 11_111 yes, 1412_1 no. How could using regex to solve this? I mean, if I could tell the regex engine just ignore these '_''s when matching then this problem becomes trivial? How could I do so?

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• Multiline Regular Expression search and replace!

  - by Scott

  I've hit a wall. Does anybody know a good text editor that has search and replace like Notepad++ but can also do multi-line regex search and replace? Basically, I am trying to find something that can match a regex like: search oldlog\(.*\n\s+([\r\n.]*)\);replace newlog\(\1\) Any ideas?

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• Substitute alt tag with title tag using sed

  - by hardc0de

  I have a PCRE regex that looks like this s/(<input.+?)alt(=".+?".*?>)/$1title$2/ Can anybody help me with making that work on sed? Eventually can anybody point me to some guide/blog post/whatever that explains differences between sed regex and pcre?

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• Javascript regular expressions: how to match ONLY the given characters?

  - by Dfowj

  I'm trying to use a regex like /[computer]{3,8}/ to get any words containing only the letters in computer ranging from 3 to 8 letters long. That regex instead captures all words containing ANY of the letters in [computer]. I've been looking at regular expression examples, but i can't quite figure it out... How do i modifiy this regular expression to capture words containing ONLY the letters in computer (with a length of 3 to 8)?

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• Regular Expression to match a string

  - by Adam Witko

  Hi, I've got two possible string inputs that my application will receive, and if it matches the following two strings, I need it regex.ismatch() to return true: "User * has logged out" "User * has joined" I'm not that good at regex and just can't figure out how to go about matching the above. Any help would be great!!!

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• regular expression for decimal numbers?

  - by James123

  I need a validation regex for decimal. It should allow upto 5 digits after decimal. Allow: 1 1.0 12.0 12.01 123.01 1,123.01 1,123.013 21,123.01234 3,21,123.01234 How Can I do regex for this?

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• How to fetch number of the text?

  - by Gordian Yuan

  I have the text like "It's the 145 of 13221 items". I need to fetch all the number of text on one time. I want to use regex to do this. What is the regex like? "\d+" is not work fine.

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• Search files for text matching format of a Unix directory

  - by BrandonKowalski

  I am attempting to search through all the files in a directory for text matching the pattern of any arbitrary directory. The output of this I hope to use to make a list of all directories referenced in the files (this part I think I can figure out on my own). I have looked at various regex resources and made my own expression that seems to work in the browser based tool but not with grep in the command line. /\w+[(/\w+)]+ My understanding so far is the above expression will look for the beginning / of a directory then look for an indeterminate number of characters before looking for a repeating block of the same thing. Any guidance would be greatly appreciated.

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• nginx regex locations w/ different roots not working as expected

  - by Wells Oliver

  I have the following two rules: location / { root /var/www/default; } location ~* /myapp(.*)$ { root /home/me/myapp/www; try_files $uri $uri/ /handle.php?url=$uri&$args; } When I browse to myapp/foo it works- kind of, the error is logged as a 404: *3 open() "/var/www/default/handle.php" failed (2: No such file or directory) - so its handling the regex match but just not using the right document root-- why is this? For the record, I am trying to get /myapp/* requests handled by the second location, and everything else the first.

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• Match exactly (and only) the pattern I specify in a grep command

  - by palswim

  Usually, grep searches for all lines containing a match for the pattern/parameter I specify. I would like to match just the pattern (i.e. not the whole line). So, if a file contains the lines: We said that we'll come. Unfortunately, we were delayed. Now, we're on our way. I want to find all contractions starting with "we" (regex pattern: we\'[a-z]+/i). And I'm looking for the output: we'll we're How do I do this (with grep or another Unix/Windows command-line tool)?

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• Select different parts of an line

  - by Ricardo Sa

  I'm new to regexes and have a file that looks like this one: |60|493,93|1,6500| |60|95,72|1,6500| |60|43,88|1,6500| |60|972,46|1,6500| I used the regex (\|60|.*)(1,65) and I was able to find all the lines that have the information that I wanted to changed. How can I make an replace that when Notepad++ finds (\|60|.*)(1,65), the 60 should be replaced with 50: |50|493,93|1,6500| |50|95,72|1,6500| |50|43,88|1,6500| |50|972,46|1,6500| PS: here's an example of the full line: |C170|002|34067||44,14000|KG|493,93|0|0|020|1102||288,11|12,00|34,57|0|0|0|0|||0|0|0|60|493,93|1,6500|||8,15|60|493,93|7,6000|||37,54||

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