### C Library Functions: Regular Expressions

regcomp | regex.h | Compiles a source regular expression into an executable version.
regerror | regex.h | Finds the description for the error code for a regular expression.
regexec | regex.h | Compares a string with a regular expression.
regfree | regex.h | Frees the memory for a regular expression, removing the compiled regular expression.

Alphabetical Listing of IBM C and C++ Compilers Functions and Macros