PHP match multiple whole words in regex

I'd like to match a 开发者_开发百科string for word1 or word but a string like 'this is a testword' should NOT give a match. I'm trying to do preg_match('/^\b(word|word1)\b/i',$string) but no luck

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I think your problem is the ^ at the start:

preg_match('/\b(word|word1)\b/i',$string);

Note that the ^ denotes the beginning of the string, so you are looking for something that starts with the options you are giving.

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Seems to work fine if you remove the ^ from the beginning of your RegEx ..