| grouping | page | description |
| M_regex | M_regex | Fortran interface to POSIX 1003.2 regular expression library using ISO_C_BINDING. |
| M_regex | regcomp | Compile a regular expression into a regex object |
| M_regex | regerror | maps a non-zero errcode from either regcomp(3f) or regexec(3f) to a human-readable, printable message. |
| M_regex | regexec | Execute a compiled regex against a string |
| M_regex | regfree | Release storage used by the internal form of the RE (Regular Expression) |
| M_regex | regmatch | return selected substring defined by the MATCHES(2, :) array |
| M_regex | regsub | perform regex substitutions |