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// Simulating infinite-length leading lookbehind in JavaScript. Uses XRegExp. | |
// Captures within lookbehind are not included in match results. Lazy | |
// repetition in lookbehind may lead to unexpected results. | |
(function (XRegExp) { | |
function prepareLb(lb) { | |
// Allow mode modifier before lookbehind | |
var parts = /^((?:\(\?[\w$]+\))?)\(\?<([=!])([\s\S]*)\)$/.exec(lb); | |
return { |