iOS: 正则表达式

　　OS中一共有3种方式进行正则表达式的匹配NSPredicate、NSRegularExpression、NSString

　　一、使用NSPredicate

void useNSPredicate()
{
    NSString *phoneNO = @"13182428488";
    NSString *regex = @"^1[3|4|5|7|8]\d{9}$";
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    BOOL isValid = [predicate evaluateWithObject:phoneNO];
    NSLog(@"%s %d", __FUNCTION__ ,isValid);
}

　　二、使用原生NSRegularExpression

void useNSRegularExpression()
{
    NSString *phoneNO = @"13182428488";
    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"^1[3|4|5|7|8]\d{9}$" options:NSRegularExpressionCaseInsensitive error:&error];
    NSTextCheckingResult *result = [regex firstMatchInString:phoneNO options:0 range:NSMakeRange(0, [phoneNO length])];
    if (result) {
        NSRange resultRange = [result rangeAtIndex:0];
        //从urlString中截取数据
        NSString *stringResult = [phoneNO substringWithRange:resultRange];
        
        NSLog(@"%s %@
", __FUNCTION__, stringResult);
    }
}

　　三、使用NSString

void useNSString()
{
    NSString *phoneNO = @"13182428488";
    NSRange range = [phoneNO rangeOfString:@"^1[3|4|5|7|8]\d{9}$" options:NSRegularExpressionSearch];
    if (range.location != NSNotFound) {
        NSLog(@"%s %@
", __FUNCTION__, [phoneNO substringWithRange:range]);
    }
}