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^([a-zA-Z][a-zA-Z0-9+-.]*):((\/\/(((([a-zA-Z0-9\-._~!$&'()*+,;=':]|(%[0-9a-fA-F]{2}))*)@)?((\[((((([0-9a-fA-F]{1,4}:){6}|(::([0-9a-fA-F]{1,4}:){5})|(([0-9a-fA-F]{1,4})?::([0-9a-fA-F]{1,4}:){4})|((([0-9a-fA-F]{1,4}:)?[0-9a-fA-F]{1,4})?::([0-9a-fA-F]{1,4}:){3})|((([0-9a-fA-F]{1,4}:){0,2}[0-9a-fA-F]{1,4})?::([0-9a-fA-F]{1,4}:){2})|((([0-9a-fA-F]{1,4}:){0,3}[0-9a-fA-F]{1,4})?::[0-9a-fA-F]{1,4}:)|((([0-9a-fA-F]{1,4}:){0,4}[0-9a-fA-F]{1,4})?::))((([0-9a-fA-F]{1,4}):([0-9a-fA-F]{1,4}))|(([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5])))))|((([0-9a-fA-F]{1,4}:){0,5}[0-9a-fA-F]{1,4})?::[0-9a-fA-F]{1,4})|((([0-9a-fA-F]{1,4}:){0,5}[0-9a-fA-F]{1,4})?::))|(v[0-9a-fA-F]+\.[a-zA-Z0-9\-._~!$&'()*+,;=':]+))\])|(([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5])))|(([a-zA-Z0-9\-._~!$&'()*+,;=']|(%[0-9a-fA-F]{2}))*))(:[0-9]*)?)((\/([a-zA-Z0-9\-._~!$&'()*+,;=':@]|(%[0-9a-fA-F]{2}))*)*))|(\/?(([a-zA-Z0-9\-._~!$&'()*+,;=':@]|(%[0-9a-fA-F]{2}))+(\/([a-zA-Z0-9\-._~!$&'()*+,;=':@]|(%[0-9a-fA-F]{2}))*)*)?))(\?(([a-zA-Z0-9\-._~!$&'()*+,;=':@\/?]|(%[0-9a-fA-F]{2}))*))?((#(([a-zA-Z0-9\-._~!$&'()*+,;=':@\/?]|(%[0-9a-fA-F]{2}))*)))?$