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Deal with regex match groups in excerpt
Original implementation has bugs if the regex contains a match group. Example: excerpt('This is a beautiful? morning', /\b(beau\w*)\b/i, :radius => 5) Expected: "...is a beautiful? mor..." Actual: "...is a beautifulbeaut..." The original phrase was being converted to a regex and returning the text either side of the phrase as expected: 'This is a beautiful? morning'.split(/beautiful/i, 2) # => ["This is a ", "? morning"] When we have a match with groups the match is returned in the array. Quoting the ruby docs: "If pattern is a Regexp, str is divided where the pattern matches. [...] If pattern contains groups, the respective matches will be returned in the array as well." 'This is a beautiful? morning'.split(/\b(beau\w*)\b/iu, 2) # => ["This is a ", "beautiful", "? morning"] If we assume we want to split on the first match – this fix makes that assumption – we can pass the already assigned `phrase` variable as the place to split (because we already know that a match exists from line 168). Originally spotted by Louise Crow (@crowbot) at mysociety/alaveteli#1557
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