JavaScript verifies URL format is legitimate

1function Isurl (str_url) {//Verify URL2     varStrregex ="^ ((https|http|ftp|rtsp|mms)?:/ /)"3+"? ([0-9a-z_!~* ' (). &=+$%-]+:)? [0-9a-z_!~* ' (). &=+$%-] [email protected])?" //FTP [email protected]4+"([0-9]{1,3}\.) {3} [0-9] {1,3}" //URL-199.194.52.184 in IP form5+"|" //Allow IP and domain (domain name)6+"([0-9a-z_!~* ' ()-]+\.) *" //domain name-www.7+"([0-9a-z][0-9a-z-]{0,61})? [0-9a-z]\." //level two domain name8+"[a-z]{2,6}]" //First level domain-. com or. Museum9+"(: [0-9]{1,4})?" //Port-:Ten+"((/?)|" //a slash isn ' t required if there is no file name One+"(/[0-9a-z_!~* ' ().;?: @&=+$,%#-]+) +/?) $"; A     varRe =NewRegExp (Strregex); -     returnre.test (str_url); -}

JavaScript verifies URL format is legitimate