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bpo-30021: Add examples for re.escape(). (#1048) #1118

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serhiy-storchaka merged 1 commit into from
Apr 13, 2017
Merged

bpo-30021: Add examples for re.escape(). (#1048) #1118

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19 changes: 15 additions & 4 deletions Doc/library/re.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -695,11 +695,22 @@ form.
Added the optional flags argument.


.. function:: escape(string)
.. function:: escape(pattern)

Return *string* with all non-alphanumerics backslashed; this is useful if you
want to match an arbitrary literal string that may have regular expression
metacharacters in it.
Escape all the characters in *pattern* except ASCII letters and numbers.
This is useful if you want to match an arbitrary literal string that may
have regular expression metacharacters in it. For example::

>>> print re.escape('python.exe')
python\.exe

>>> legal_chars = string.ascii_lowercase + string.digits + "!#$%&'*+-.^_`|~:"
>>> print '[%s]+' % re.escape(legal_chars)
[abcdefghijklmnopqrstuvwxyz0123456789\!\#\$\%\&\'\*\+\-\.\^\_\`\|\~\:]+

>>> operators = ['+', '-', '*', '/', '**']
>>> print '|'.join(map(re.escape, sorted(operators, reverse=True)))
\/|\-|\+|\*\*|\*


.. function:: purge()
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2 changes: 2 additions & 0 deletions Doc/tools/susp-ignored.csv
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Expand Up @@ -99,6 +99,8 @@ library/profile,,:lineno,ncalls tottime percall cumtime percall filename:lin
library/profile,,:lineno,filename:lineno(function)
library/pyexpat,,:elem1,<py:elem1 />
library/pyexpat,,:py,"xmlns:py = ""http://www.python.org/ns/"">"
library/re,,`,!#$%&'*+-.^_`|~:
library/re,,`,\!\#\$\%\&\'\*\+\-\.\^_\`\|\~\:
library/smtplib,,:port,method must support that as well as a regular host:port
library/socket,,::,'5aef:2b::8'
library/sqlite3,,:memory,
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