reg ex expression - finding long character strings

From: lawrence (lkrubner_at_geocities.com)
Date: 05/30/04 

Date: 30 May 2004 10:07:45 -0700

This reg ex will find me any block of strings 40 or more characters in
length without a white space, yes?

[^ ]{40}

To get it to include tabs and newlines, do I to this?

[^ \n\t]{40}

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