"Lookahead" implies "characters following", if it was "lookbehind" it would be "characters preceding". "negative lookahead" means that the following characters can not match. "Negative lookbehind" would mean that the preceding characters can not match.

---
$world=~s/war/peace/g

In reply to Re^3: Why isn't this regex greedy? by demerphq
in thread Why isn't this regex greedy? by Melly

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