| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var uncurryThis = require('../internals/function-uncurry-this');
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| 4 | var toString = require('../internals/to-string');
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| 5 | var padStart = require('../internals/string-pad').start;
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| 6 | var WHITESPACES = require('../internals/whitespaces');
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| 7 |
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| 8 | var charCodeAt = uncurryThis(''.charCodeAt);
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| 9 | var replace = uncurryThis(''.replace);
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| 10 | var numberToString = uncurryThis(1.1.toString);
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| 11 | var NEED_ESCAPING = RegExp('[!"#$%&\'()*+,\\-./:;<=>?@[\\\\\\]^`{|}~' + WHITESPACES + ']', 'g');
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| 12 |
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| 13 |
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| 14 |
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| 15 | $({ target: 'RegExp', stat: true, forced: true }, {
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| 16 | escape: function escape(S) {
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| 17 | var str = toString(S);
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| 18 | var firstCode = charCodeAt(str, 0);
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| 19 |
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| 20 | return (firstCode > 47 && firstCode < 58 ? '\\x3' : '') + replace(str, NEED_ESCAPING, function (match) {
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| 21 | var hex = numberToString(charCodeAt(match, 0), 16);
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| 22 | return hex.length < 3 ? '\\x' + padStart(hex, 2, '0') : '\\u' + padStart(hex, 4, '0');
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| 23 | });
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| 24 | }
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| 25 | });
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