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Regular Expression Details

Title Test Find Pattern Title
Expression
(?i:([A-D])(?!\1)([A-D])(?!\1|\2)([A-D])(?!\1|\2|\3)([A-D]))
Description
This regex validates a string of non-repeating characters A, B, C, D.
Matches
abcd | dbca | badc
Non-Matches
abba | baaa | cabb
Author Rating: Not yet rated. Michael Ash
Source
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Existing User Comments

Title: Re: Avoid Consecutive spaces
Name: Michael Ash
Date: 10/22/2004 11:44:31 PM
Comment:
Allow and avoid in what? A sentence? An Equation? A phone number? It may be easier to trim extra spaces.


Title: Avoid Consecutive spaces
Name: mansoor
Date: 10/22/2004 12:42:38 PM
Comment:
Hi, How can we allow spaces but avoid consecutive spaces. Any help would be appreciated. Thanks


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