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Add example for regex_replace using named groups #13322

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Dec 2, 2015
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Add example for regex_replace using named groups #13322

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3 changes: 3 additions & 0 deletions docsite/rst/playbooks_filters.rst
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Expand Up @@ -520,6 +520,9 @@ To replace text in a string with regex, use the "regex_replace" filter::
# convert "foobar" to "bar"
{{ 'foobar' | regex_replace('^f.*o(.*)$', '\\1') }}

# convert "localhost:80" to "localhost, 80" using named groups
{{ 'localhost:80' | regex_replace('^(?P<host>.+):(?P<port>\\d+)$', '\\g<host>, \\g<port>') }}

.. note:: Prior to ansible 2.0, if "regex_replace" filter was used with variables inside YAML arguments (as opposed to simpler 'key=value' arguments),
then you needed to escape backreferences (e.g. ``\\1``) with 4 backslashes (``\\\\``) instead of 2 (``\\``).

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