php regex to match outside of html tags

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You can use an assertion for that, as you just have to ensure that the searched words occur somewhen after an >, or before any <. The latter test is easier to accomplish as lookahead assertions can be variable length:

/(asf|foo|barr)(?=[^>]*(<|$))/

See also http://www.regular-expressions.info/lookaround.html for a nice explanation of that assertion syntax.

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