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'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var toString = require('../internals/to-string');
var WHITESPACES = require('../internals/whitespaces');
var charCodeAt = uncurryThis(''.charCodeAt);
var replace = uncurryThis(''.replace);
var NEED_ESCAPING = RegExp('[!"#$%&\'()*+,\\-./:;<=>?@[\\\\\\]^`{|}~' + WHITESPACES + ']', 'g');
// `RegExp.escape` method
// https://github.com/tc39/proposal-regex-escaping
$({ target: 'RegExp', stat: true, forced: true }, {
escape: function escape(S) {
var str = toString(S);
var firstCode = charCodeAt(str, 0);
// escape first DecimalDigit
return (firstCode > 47 && firstCode < 58 ? '\\x3' : '') + replace(str, NEED_ESCAPING, '\\$&');
}
});