To invoke the REX regular expression pattern matcher within a query precede the expression with a '/' (forward slash).
Examples:
Expression Purpose
---------------------------------------------------------------------------
/19[789][0-9] Find years between 1970 and 1999
/[1-9][01][0-9]-?[0-9]{3}-=[0-9]{4} Any USA Phone Number
/\n=\space+Clinton Find 'Clinton' as the first word
in a Paragraph
/\upper=\lower+\space\upper=\lower+ Proper Names without initials
like: John Smith
/(abc904) finds '(abc904)' anywhere it exists
back up