regex match string that does not contain substr and case insensitive

I have a a string like maxreheattemp. I want my regex test to fail when the substring reheat is in it. I can do that with

^((?!reheat).)*$

but I also want my test to be case insensitive. I usually use (?i) for that, but can't find a way to combine the two so that maxReHeattemp also fails.

How do I do that?

1 Answer

With PCRE engine, you can do:

^(?i)((?!reheat).)*$

Demo & explanation

3

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