Is there a tutorial on regular expressions?

Problem
Is there a tutorial on regular expressions?
Solution
A tutorial on regular expressions is urgently needed.
It is better to be a video or a manual.
I have an English document but I cannot understand it.

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This post should belong to "help" rather than "solved ".
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Forums: search ,,
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Search by Baidu or GOOGLE
JavaScript for Microsoft. chm
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Is the Regular Expression in php the same as that in javascript?
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Perl compatibility is no different
The regular expression I learned is the same as the jscript on the 4th floor.
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[Url = Response
Tutorial. It is recommended that you read this article ~!