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/*!
 * is-glob <https://github.com/jonschlinkert/is-glob>
 *
 * Copyright (c) 2014-2017, Jon Schlinkert.
 * Released under the MIT License.
 */

var isExtglob = require('is-extglob');
var chars = { '{': '}', '(': ')', '[': ']'};
var strictRegex = /\\(.)|(^!|\*|[\].+)]\?|\[[^\\\]]+\]|\{[^\\}]+\}|\(\?[:!=][^\\)]+\)|\([^|]+\|[^\\)]+\))/;
var relaxedRegex = /\\(.)|(^!|[*?{}()[\]]|\(\?)/;

module.exports = function isGlob(str, options) {
  if (typeof str !== 'string' || str === '') {
    return false;
  }

  if (isExtglob(str)) {
    return true;
  }

  var regex = strictRegex;
  var match;

  // optionally relax regex
  if (options && options.strict === false) {
    regex = relaxedRegex;
  }

  while ((match = regex.exec(str))) {
    if (match[2]) return true;
    var idx = match.index + match[0].length;

    // if an open bracket/brace/paren is escaped,
    // set the index to the next closing character
    var open = match[1];
    var close = open ? chars[open] : null;
    if (open && close) {
      var n = str.indexOf(close, idx);
      if (n !== -1) {
        idx = n + 1;
      }
    }

    str = str.slice(idx);
  }
  return false;
};