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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})')
+
+