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**********
re_match()
**********
Purpose
=======
re_match(expr, re)
Returns 1, if expr matches re, 0 otherwise. Uses POSIX ERE. In contrast to
`re_match_i()` the matching is case-sensitive.
.. note::
Functions using regular expressions tend to be slow and other options
may be faster.
Example
=======
In the following example it is checked if the msg object matches the regex string.
.. code-block:: none
re_match($msg,'(5[1-5][0-9]{14})')
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