|SRC="the source data"
REGEX="a regular expression"
This tag determines if there is a match with the regular expression. Returns 0 or the index to the first , if there is a match. Please refer to books on regular expressions for a description of how to use them. SRC is the source data, REGEX is the regular expression and FLAGS is used to determine the type of regular expression handling to employ. See iREGEXLIST for a description of the FLAGS.