Questions tagged [pcre]

Perl Compatible Regular Expressions(PCRE) was initially developed as a regex engine for PERL, but grew into a library that many other languages (like PHP and Apache) use for their regex. Use with the [regex] tag and any appropriate language tags.

PCRE is an initialism for Perl Compatible Regular Expressions. It is both name of a regex flavor and the library that implements it and makes it available for use by other programs (e.g. apache, php).

Despite being designed with compatibility in mind, pcre are not 100% compatible with perl regular expressions (perlre). PCRE passes many of Perl’s regression tests, though. Comparison can be found in community-authored article on Wikipedia, as suggested by PCRE homepage.

Since POSIX regex deprecation in PHP 5.3, PCRE is PHP’s only supported regex engine.

References

Apache uses PCRE

2401 questions

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Regular expression to perform named capture of user agent string variations

I am trying to come up with a regular expression capable of capturing an entire user agent string as a single named group logged in one of the 2 following formats: Mozilla/5.0+(compatible;+MSIE+9.0;+Windows+NT+6.1;+WOW64;+Trident/5.0) "Mozilla/5.0…

regex pcre

asked Oct 22 '13 at 22:23

porcus

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2 answers

Extracting tail from a string using PCRE

I am looking for a PCRE regular expression match pattern with which I can use in C language to extract the tail fragment of a string. My expected effect is to extract the string following string "en", which can be immediately followed by nothing,…

regex url fragment pcre

asked Oct 21 '13 at 12:40

Masao Liu

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1 answer

Find URLs in HTML-Sourcecode which are not yet tagged. Ignore tagged URLs

I'd like to find URLs in HTML Sourcecode. But only URL which don't have Tags around them. I came up with this: (?) It does a good job avoiding URL which are part of links but…

html regex tags grep pcre

asked Oct 15 '13 at 21:12

shorshe

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1 answer

pcre regex for removing adjacent duplicates

Given a string having duplicate characters, what would be the proper regex to remove adjacent duplicates? I am unable to figure out how to use backreference to write final output. For eg. input: "1111112222223333344444111"; output: "12341"

regex pcre

asked Oct 03 '13 at 03:35

Sushil

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5 answers

Regular expression libraries for Mac OS X 10.6

Is there a library compatible with PCRE that can be used on Mac OS X 10.6, and which is Unicode compatible? I was thinking to use the predicates, but it is a little excessive when the application is not already using Spotlight predicates.

objective-c regex pcre

asked Dec 15 '09 at 02:43

apaderno

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Match a code string in some text

I have some code strings that I need to extract some data from, but specific data at that. The strings are always in the same format. I need to extract the text at the beginning between the ( and ), so it would extract List Options here. I need to…

regex pcre

asked Sep 26 '13 at 00:58

user2806964

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3 answers

how to exclude match from regex in result

i have this simple dumy text and my regex patterns…

regex preg-replace pcre

asked Sep 23 '13 at 07:54

dev.meghraj

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grep equivalent to pcre's `?` operator

With PCRE you'd do ax?a to find strings like aa and axa. How would you write a regex for grep that'd do that?

regex grep pcre

asked Aug 27 '13 at 21:01

neubert

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Haskell regex-pcre negate expression

How can I achieve an inverse match so that for example getAllTextMatches $ "foobar bar bl a" =~ pattern :: [String] would prodcuce a list of strings that are not multiple whitespace. I've tried getAllTextMatches $ "foobar bar bl a"…

regex haskell pcre

asked Aug 18 '13 at 21:11

Dominik Danter

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1 answer

Testing if a user input string contains a regular expression

In my program I allow an administrator to define what a particular string format should be in part of a template document. This may contain a regular expression, or it might just be a literal string. If it's a literal string, then I want to copy the…

c regex pcre

asked Aug 15 '13 at 08:04

Piers

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1 answer

pcre can not support mutiple subgroups

This is about pcre multiple subgroups, subject is : const char* subject = "http://mail.google.com:443"; I wanna to find protocol&domain&port, and my regex like this, but pcre_exec return 0 const char* regex_str = "([^/]+)//([^:]+):(\\d+)"; but…

c++ c pcre

asked Jul 29 '13 at 10:17

gaconel

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1 answer

Can a string be padded to match a regular expression?

I'm facing an optimization problem in a program that searches files whose path match a given regular expression (PCRE). Typical expressions could be: ^C:\test\(a|b)\foo\bar ^C:\test\[^\\]+\foo ^C:\test\.*\foo Right now the implementation detects…

regex pcre

asked Jul 06 '13 at 14:30

Daniel Stelter

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0 answers

Rebuild PHP with the newest PCRE

I have a Ubuntu 12.04 server where I updated the PHP from 5.3 to 5.4 but the PCRE version is still at 8.12. I then installed pcre from source and it should be the 8.33 version but php info is still showing 8.12. How can I make PHP use the new…

php ubuntu pcre

asked Jun 21 '13 at 09:15

ObSeSSeN

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1 answer

PCRE whole word match (only spaces allowed as separator)

I want to match string as a whole word match "~\b$search\b~i", it matches '35' to '35-40'. I want only space to be separator between words. Test cases: Matching 35 in following cases: 35-40 => false 3-5 => false 335 => false 350 => false 35 =>…

php preg-match pcre

asked Jun 09 '13 at 12:44

Osvaldas

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1 answer

PHP 5.4 - CodeIgniter - PCRE library issue workaround in shared-hosting

I'm going to move codeigniter project from my computer to a public server (virtual private server where it has Cpanel installed in it). In the public server I got the error : Message: preg_match(): Compilation failed: unknown option bit(s) set at…

php cpanel pcre shared-hosting

asked Jun 04 '13 at 08:12

Hendry H.

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