Check string against a regular expression.
1 on regular expression match or
Please note that the space following the double quotes separating the regex from the data is optional and if present, is skipped. If a space is desired at the beginning of the data, then put two spaces there; the second will not be skipped.
REGEX("regular expression" string)
This documentation was imported from Asterisk Version GIT-19-56f9c28a50