G'day petro4213,

Welcome to the Monastery.

Without any code, it's unclear what you're actually attempting and how it's not doing what you want. Please read "How do I post a question effectively?". Then provide a "SSCCE": keep it short; do not include cosmetic elements (e.g. colours, fonts, etc.); include a small piece of ASCII art to describe your GUI where appropriate (although, there's probably no need here).

Read the documentation for Tk::Entry, especially the VALIDATION section.

— Ken

In reply to Re: Tk::Entry widget with textvariable and validatecommand by kcott
in thread Tk::Entry widget with textvariable and validatecommand by petro4213

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