Case-Insensitive Search

Posted on 2015-01-18
Last Modified: 2015-01-18
How do I make the following work?  I want match.Success to be True regardless of the case.  If the testString = "AAA" or testString = "aAa"  

dim testString as string = "AAa"

Dim match As Match = Regex.Match(testString , "([\s\S])\1\1")
Question by:Ray Turner
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Expert Comment

ID: 40556137

Why not?

refer to

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Assisted Solution

Qlemo earned 500 total points
ID: 40556147
\s is whitespace, \S non-whitespace, so your regex is completely wrong.

You might be able to use the Posix notification (not sure about that, but it works in PowerShell): "^[:alpha:]{3}$"
Or case-insensitive search modifier and a character class: "^(?i)[A-Z]{3}$"
Or using a character class only: "^[A-Za-z]{3}$"

This assumes you want to  have exactly 3 letters.

Author Comment

by:Ray Turner
ID: 40556173
Why is the regex completely wrong?  Are you saying this is not valid? I thought \s\S is the same as .
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Accepted Solution

Qlemo earned 500 total points
ID: 40556178
It is a valid regex asking for any arbitrary character repeated 3 times. But then why you are not using just a dot?
Is your target exactly that? Any repetition of a character at least for 3 times, ignoring case? No matter if it is a letter, digit, whitespace ...

Author Comment

by:Ray Turner
ID: 40556181
Yes.  That's what I am trying to do.

Author Comment

by:Ray Turner
ID: 40556204
Sorry,  how do I modify the following to do just that?

Dim match As Match = Regex.Match(testString , "(.)\1\1")

Author Closing Comment

by:Ray Turner
ID: 40556274
I solve my problem with the following solution:

Dim match As Match = Regex.Match(testString.ToLower() , "(.)\1\1")
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Expert Comment

ID: 40556288
Dim match As Match = Regex.Match(testString, "(?i)(.)\1\1")
should do also.

Author Comment

by:Ray Turner
ID: 40556340
Thanks!  It does indeed.

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