'via Blog this'
Cut-n-pasted from there:
So in English, the regEx I came up with, word(?!([^<]+)?>), could be interpreted as:
Match the characters "word" literally word
Assert that it is impossible to match the regex below starting at this position (negative lookahead) (?!([^)
Match the regular expression below and capture its match into backreference number 1 ([^<]+)? Between zero and one times, as many times as possible, giving back as needed (greedy) ? Match any character that is not a "<" [^<]+ Between one and unlimited times, as many times as possible, giving back as needed (greedy) + Match the character ">" literally >
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