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Reference - What does this regex mean?

What is this?

This is a collection of common Q&A. This is also a Community Wiki, so everyone is invited to participate in maintaining it.

Why is this?

[tag:regex] is suffering from give me ze code type of questions and poor answers with no explanation. This reference is meant to provide links to quality Q&A.

What's the scope?

This reference is meant for the following languages: [tag:php], [tag:perl], [tag:javascript], [tag:python], [tag:ruby], [tag:java], [].
This might be too broad, but these languages share the same syntax. For specific features there's the tag of the language behind it, example:

  • What are regular expression Balancing Groups? []

The list


Character classes:





Escape sequence:

Other: not sure about the name ...

Control verbes: [tag:php] [tag:perl]

Recursion: [tag:php] [tag:perl]

Advanced regex-fu


Should I leave comments or edit directly? if the latter: How?


You can fork it and then I will merge it.


How do you merge a gist?


@KyraD you can clone your gist on your disk, pull another (updated) gist and then push it

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