JS regular expression examples from <<good parts>>
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//parse_url/^(?:([A-Za-z]+):)?(\/{0,3})([0-9.\-A-Za-z]+)(?::(\d+))?(?:\/([^?#]*))?(?:\?([^#]*))?(?:#(.*))?$///ignore case, the other two flags are 'g', 'm'/^abc$/i"into".match(/in|int/)\d is same as [0-9], \D is same as [^0-9]\s is same as[\f\n\r\t...], \S is same as[^...]\w is same as [0-9A-Z_a-z]// \1 is a reference to group 1, \2 to group2/([A-Za-z]+)\s+\1///regexp class[aeiou]//quantifier/w{3}//w{3,6}//w{3,}/var m = "wwwwdddd".match(/(w{3,})(d+)/);m should be an array ["wwwwdddd", "wwww", "dddd"]