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1/** Used to compose unicode character classes. */
2var rsAstralRange = '\\ud800-\\udfff',
3 rsComboMarksRange = '\\u0300-\\u036f',
4 reComboHalfMarksRange = '\\ufe20-\\ufe2f',
5 rsComboSymbolsRange = '\\u20d0-\\u20ff',
6 rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
7 rsVarRange = '\\ufe0e\\ufe0f';
8
9/** Used to compose unicode capture groups. */
10var rsZWJ = '\\u200d';
11
12/** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
13var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
14
15/**
16 * Checks if `string` contains Unicode symbols.
17 *
18 * @private
19 * @param {string} string The string to inspect.
20 * @returns {boolean} Returns `true` if a symbol is found, else `false`.
21 */
22function hasUnicode(string) {
23 return reHasUnicode.test(string);
24}
25
26module.exports = hasUnicode;