}

這里面的self 是因?yàn)檫@個(gè)方法是寫在category的 NSString + SiZheString.m 中

所以調(diào)取方式應(yīng)該是

if([@"字符串"  validateEmail]){

}

這種樣式

  NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+//.[A-Za-z]{2,4}";    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];   Bool  isTrue =  [emailTest evaluateWithObject:@"字符串"];