| Character String Matching Functions and Subroutines | 
| CALL RXCHANGE | changes one or more substrings that match a pattern | 
| CALL RXFREE | frees memory allocated by other regular expression (RX) functions and CALL routines | 
| RXMATCH | finds the beginning of a substring that matches a pattern | 
| RXPARSE | parses a pattern | 
| CALL RXSUBSTR | finds the position, length, and score of a substring that matches a pattern | 
| CALL PRXCHANGE | performs a pattern matching substitution | 
| CALL PRXDEBUG | enables Perl regular expressions in a DATA step to send debug output to the SAS log | 
| CALL PRXFREE | frees unneeded memory that was allocated for a Perl regular expression | 
| PRXMATCH | searches for a pattern match and returns the position at which the pattern is found | 
| CALL PRXNEXT | returns the position and length of a substring that matches a pattern and iterates over multiple matches within one string | 
| PRXPAREN | returns the last bracket match for which there is a match in a pattern | 
| PRXPARSE | compiles a Perl regular expression that can be used for pattern matching of a character value | 
| CALL PRXPOSN | returns the start position and length for a capture buffer | 
| CALL PRXSUBSTR | returns the position and length of a substring that matches a pattern |