正则

       - (BOOL)urlRegExprWithText:(NSString *)text pattern:(NSString *)pattern{


NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];


NSArray *resultArr = [expression matchesInString:text options:NSMatchingReportCompletion range:NSMakeRange(0, text.length)];


if (resultArr.count == 0) {
    return NO;
}

return YES;
 }