>>>>Sergey,
>>>>
>>>>Again, great for noticing. I understood this bug at home too, but your message was a reminder to me to fix it. I'll do it right now.
>>>>
>>>>Thanks again for your help. I noticed, you often use this technique, and I'll start too. I also will investigate "Ed's route"...
>>>>
>>>Out of general boredom:
>>>
>>>

oRegExp=CREATEOBJ('vbscript.regexp')
>>>oRegExp.Pattern = '\d{6}[A-Z]-[A-Z]\d{6}[A-Z]-[A-Z]\d{6}[A-Z]{2}-[A-Z]{2}\d{6}[A-Z]'
>>>? oRegExp.Test('012345A-B012345C-D012345EF-GH012345I')
>>>? oRegExp.Test('012345A-b012345C-D012345EF-GH012345I')

>>
>>Great, Ed. Thanks a lot. One little problem: [A-Z] could be also space, e.g.
>>in mask: lcMask = "999999X-X999999X-X999999XX-XX999999X"
>>X could be upper alpha or space.
>
>Like this is difficult? Change [A-Z] to [A-Z ]
>
>This is definitely a case of RTFM; you neeed to read the docs to see what all the capabilities are.

Yes, I'm reading :)

lcAPN = "000000 - 001000 - 000000 - 000000"
oRegExp=CREATEOBJ('vbscript.regexp')
oRegExp.Pattern = '\d{6}[A-Z ]-[A-Z ]\d{6}[A-Z ]-[A-Z ]\d{6}[A-Z ]{2}-[A-Z ]{2}\d{6}[A-Z ]'
? oRegExp.Test(lcApn) && .F. - should be .T.