Python re Module - Use Regular Expressions with Python - Regex Support - The Diigo Meta page

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  • To get all matches from a string, call re.findall(regex, subject). This will return an array of all non-overlapping regex matches in the string. "Non-overlapping" means that the string is searched through from left to right, and the next match attempt starts beyond the previous match. If the regex contains one or more capturing groups, re.findall() returns an array of tuples, with each tuple containing text matched by all the capturing groups. The overall regex match is not included in the tuple, unless you place the entire regex inside a capturing group.
  • You can use   and \t in raw strings. Though raw strings do not support these escapes, the regular expression engine does. The end result is the same.
  • To avoid this confusion, just use Unicode raw strings like ur"\u00E0\d". Then backslashes don't need to be escaped. Python does interpret Unicode escapes in raw strings.

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  • The first thing to do is to import the regexp module into your script with import re.
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  • Alternatively, you can specify re.U or re.UNICODE to treat all letters from all scripts as word characters.
  • The only limitation of using raw strings is that the delimiter you're using for the string must not appear in the regular expression, as raw strings do not offer a means to escape it.
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  • Python is a high level open source scripting language. Python's built-in "re" module provides excellent support for regular expressions, with a modern and complete regex flavor,. The only feature currently missing from Python's regex syntax are atomic grouping and possessive quantifiers.
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