IOS gets the parameters in the URL

-(NSString *) Getparambyname: (NSString *) name urlstring: (NSString *) url{    nserror *error;    NSString *regtags=[[nsstring alloc] initwithformat:@ "(^|&|\\?) +%@=+ ([^&]*) (&|$) ", name];    Nsregularexpression *regex = [nsregularexpression regularexpressionwithpattern:regtags                                                                           options: Nsregularexpressioncaseinsensitive                                                                             error:&error];        Perform the matching process    nsarray *matches = [regex matchesinstring:url                                      options:0                                        range:nsmakerange (0, [url length])];    For (Nstextcheckingresult *match in matches) {        nsstring *tagvalue = [url substringwithrange:[match rangeatindex:2]] ;  The string return tagvalue of the corresponding group 2        ;    }    return @ "";}

　　

IOS gets the parameters in the URL