PHP regex patterns

Question

I want to know how regex patterns are written. Where is their base and what do I need to know in order to write patterns. I have absolutely no idea on how to write my own patterns and I am quite in a need of finding a particular match in some of my code.

Is this some math based subject? Give me all possible information about patterns please :)

Great resource: regular-expressions.info (second hit on Google, right after the Wikipedia entry) — Felix Kling
– Felix Kling, Commented Aug 6, 2011 at 13:29
+1 for the question. Finally somebody is asking where to start! @Felix Kling: Yeah that site is worth the visit. — hakre
– hakre, Commented Aug 6, 2011 at 13:40

Pascal MARTIN · Accepted Answer · 2011-08-06 13:28:25Z

4

I would say you need to read the PCRE Patterns section of the manual -- and, more specificaly, the Pattern Syntax sub-section ;-)

Pretty much everything about PCRE is in there¹.

Considering that PCRE are, afterall, Perl-Compatible Regular Expressions, you might also want to read some Perl-related documentation ; for exemple : perlre.

^1._{Well, once again, the PHP manual is so great, it wasn't possible to not link to it...}

answered Aug 6, 2011 at 13:28

Pascal MARTIN

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Community · Accepted Answer · 2017-05-23 09:58:59Z

1

Pascal Martin already pointed to some useful online resources. If you're looking for a book, I can suggest Mastering Regular Expressions.

edited May 23, 2017 at 9:58

CommunityBot

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answered Aug 6, 2011 at 13:42

hakre

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