Find a word that doesn't come after another word with RegEx

Question

What is a RegEx pattern that I have to use to match a specific word that doesn't come after another specific word?

For example:

I am looking for "abc" that does not appear after "xyz", so the following will match:

xxabc

p abc

And the following will not be:

xyz abc

Thanks!

Answer 1

The easiest way is a negative lookbehind statement:

(?<!xyz)(?<!xyz )abc

, abc xyz. abc, xyz , :

^(?!xyz)*((?!xyz).)*abc

, lookbehind.

Answer 2

- :

(?<!xyz )abc

Debuggex

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