NSPredicate 与正则表达式检查字母数字 [英] NSPredicate with regex to check alphanumeric

问题描述

我想在 Objective c 中用正则表达式检查字符串.我的代码

I want to check string with regex in Objective c. My code

NSString *regexAmazonOrder =@"[a-zA-Z0-9]*";
NSPredicate *predicateAmazonOrder = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regexAmazonOrder];

if([predicateAmazonOrder evaluateWithObject:cardNumber.text])
{
    NSLog(@"Its coming inside AMAZON ORDER EVALUATIONS");
    ...
}

但它不起作用.帮帮我.我知道这很简单，但吃我的心！谢谢

But its not working. Help me out. I know its simple but eating my mind!!! Thanks

推荐答案

试试这个:(未经测试，只是给你一个入门)

Try like this: (Untested, just to give you an starter)

NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[a-z0-9]*"
                                                                       options:NSRegularExpressionCaseInsensitive
                                                                         error:&error];
NSArray *matches = [regex matchesInString:cardNumber.text
                                  options:0
                                    range:NSMakeRange(0, [string length])];

if([matches count] > 0)
{
   // Valid input
}

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