bug2078698.js - mozsearch

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var subject = "abc" + String.fromCodePoint(0x1F600);

var wide = "(?:[\\u{1F600}])$" + String.fromCharCode(0x1234);

var pattern = wide.substring(0, wide.length - 1);

if (pattern !== "(?:[\\u{1F600}])$") throw new Error("unexpected pattern text");

var unanchored = new RegExp("(?:[\\u{1F600}])", "u").exec(subject);

if (unanchored === null || unanchored.index !== 3 || unanchored[0].length !== 2) throw new Error("unanchored form must match at index 3");

var m = new RegExp(pattern, "u").exec(subject);

if (m === null) throw new Error("end-anchored class failed to match the final code point");

if (m.index !== 3) throw new Error("wrong index " + m.index);

if (m[0].length !== 2) throw new Error("wrong match length " + m[0].length);