Match word outside of specific sentence

Question

I was wondering if it's possible to match a word outside of a sentence.

This is the regex I have so far:

/(exchange|occasion|second hand)/im

Now I only want to match these words outside of this sentence:

Shown prices, for exchange of ocassions are only for indication.

But I'm not sure how to go about this.

Answer 1

You can use PCRE verb (*SKIP)(*FAIL) to match and skip anything on LHS of an alternation like this:

/Shown prices, for exchange of ocassions are only for indication\.(*SKIP)(*F)|\b(exchange|occasion|second hand)\b/i

RegEx Demo