Hello List. I'm trying to build a regular expresion that match the next line : Param1 : E384AFC2-529C-4AA1-AE16-273A3C7DD889 I mean : [8 characters from 0 to 9 and A to D]-[4 characters from 0 to 9 and A to D]-[4 characters from 0 to 9 and A to D]-[4 characters from 0 to 9 and A to D]-[12 characters from 0 to 9 and A to D] Any help? The textops re are like the "linux vi" re? Thanks Ricardo Martinez.-