http://tcl.activestate.com/man/tcl8.4/TkCmd/entry.htm

An entry box is designed to allow the user to enter one line of text
for use by the application.

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Hopefully, people will add new pages demonstrating various techniques for doing entry box validation of some common formats, like phone numbers, etc.

[Entry Field Processing]

[Validating Credit Card Check Digits]

[Entry box validation for IP address]

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