GPDL $GREP

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$GREP is a regular-expression compiler and search engine. If you know what that means then all is well. Otherwise you should check out the topic "regular expressions".

$GREP implements 'egrep' regular expressions.

    $GREP ( regularExpression, string)

Return value:

The string is searched using the regular expression and returns true ("1") or false ("") depending on whether a match is or is not successful.

As a side-effect, if the match is successful, any substrings that were matched are put safely away where you can reference them before using $GREP (or $GCASE) again. You reference these sub-strings with $WIGGLE.