Invalid characters

[ramblinrose]

I have been asked to provide a report that will display errors for data entry. If the field {{Command.birth_name_last} includes any characters that are not a-z or A-Z or include numbers then I am to display a message. I have tried several methods, but no luck yet. Using Crystal 2008 connected to a Cache data source.

I have tried several different formulas one being:
InStr ({Command.birth_name_last},'[a-zA-Z]')
and nothing seems to work.

Thank you.

 

[CoSpringsGuy]

just quickly looking at your post you should have a , between zA

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Crystal Reports 2011 and XI
Intersystems Cache 2012 ODBC connection