This is a good thing to try to remember; it can come up a lot.

Caveat: doesn't work if you need to support nested bar/qux pairs, e.g. only replacing the first and last foo in: foo bar foo bar foo qux foo qux foo

In reply to Re^3: Match a pattern only if it is not within another pattern by ysth
in thread Match a pattern only if it is not within another pattern by punkish

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