Simple RegEx Tutorial. Regular Expression can be used in Content Filter conditions. Regular Expressions can be extremely complex but they are very flexible and powerful and can be used to perform comparisons that cannot be done using the other checks available.
Evaluates the regular expression pattern and determines if it is contained within string. This function is similar to the LIKE operator, except that the pattern only needs to be contained within string, rather than needing to match all of string. In other words, this performs a contains operation rather than a match operation.