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Unicode Regular Expression Guidelines - http://www.unicode.org/unicode/reports/tr18/
Unicode Technical Report #18: This document describes guidelines for how to adapt regular expression engines to use Unicode. |
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Regular Expressions Tutorial - http://www.regular-expressions.info/
A tutorial and reference for many popular regular expression flavors used by programming languages like Perl, PHP, Java, C# and VB.NET as well as a description of general tools like PowerGREP and EditPad. |
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Regular Expression HOWTO - http://www.amk.ca/python/howto/regex/regex.html
Detailed HowTo documentation about regular expressions usage in combination with the Phyton programming/scripting language. |
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Regular Expressions - Single Unix Specification - http://www.opengroup.org/onlinepubs/007908799/xbd/re.html
Specification for regular expressions -- massive document, somewhat technical. |
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grep - Regular Expressions - http://www.gnu.org/software/grep/doc/grep_7.html
Documentation of the Regular Expression syntax used in GNU grep. |