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Home/ Questions/Q 7021115
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T23:24:27+00:00 2026-05-27T23:24:27+00:00

I am having trouble trying to put a regular expression in the right order.

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I am having trouble trying to put a regular expression in the right order. It’s for C#, could anyone please help?

Im trying to replace the sas to say yyy.

Original: sas sas2 sas-def def-sas SASsas

The result should be

Result: yyy yyy2 yyy-def def-yyy SASsas

So you can see I want to replace the sas whenever it doesn’t have a letter on either side of it.

Driving me nuts!

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  1. Editorial Team
    Editorial Team
    2026-05-27T23:24:28+00:00Added an answer on May 27, 2026 at 11:24 pm

    You need to use both a negative lookahead and a negative lookbehind:

    (?<![a-zA-Z])sas(?![a-zA-Z])
    
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