| 1 | /**
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| 2 | * Find each match of a regular expression in a string, apply a function to
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| 3 | * each match and replace the matched string with the result of the function.
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| 4 | *
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| 5 | * @param {String} str
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| 6 | * @param {RegExp} re
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| 7 | * @param {Function} fn
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| 8 | * @param {String} newstr
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| 9 | * @api public
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| 10 | */
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| 11 |
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| 12 | exports.gsub = function (str, re, fn, /*optional*/newstr) {
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| 13 | newstr = newstr || '';
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| 14 | var match = re.exec(str);
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| 15 | if (match) {
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| 16 | newstr += str.slice(0, match.index);
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| 17 | newstr += fn.apply(null, match);
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| 18 | remaining = str.slice(match.index + match[0].length);
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| 19 | return exports.gsub(remaining, re, fn, newstr);
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| 20 | }
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| 21 | return newstr + str;
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| 22 | };
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