ios - iOS中的正则表达式(单词，字母和特殊字符)

Question

在以下方法中，如果要检查以下内容，我想检查UITextField文本:
它包含一个或多个英语单词，以及一个或多个数字，并让其可选地包含特殊字符(!@ $＆＃)
返回true，否则返回false。

#define pattern   @"^[a-zA-Z0-9\\u0021\\u0040\\u0023\\u0024\\u0026]{1}*$"

- (BOOL)stringHasCorrectFormat:(NSString *)str {

      if ([str componentsSeparatedByString:SPACE].count > 1)
         return NO;
      NSString *regularPattern = EMPTY_STRING;
      regularPattern = [regularPattern stringByAppendingString:pattern]
      NSRegularExpression *regex = [NSRegularExpression
                              regularExpressionWithPattern:regularPattern
                              options:NSRegularExpressionCaseInsensitive
                              error:nil];



      NSTextCheckingResult *match = [regex
                               firstMatchInString:str
                               options:0
                               range:NSMakeRange(0, [str length])];


     if (match != nil) {
         return YES;
     }

     return NO;
}

谢谢

Answer 1

描述

^(?=.*[a-z])(?=.*[0-9])[a-z0-9!@$&#]*$

此正则表达式将执行以下操作:

(?=.*[a-z])要求该字符串包含至少一个a-z字符

(?=.*[0-9])要求该字符串包含至少一个0-9字符

[a-z0-9!@$&#]*$允许字符串仅由a-z字符，0-9字符和!@$&#符号

组成

例

现场演示

https://regex101.com/r/mC3kL3/1

说明

NODE                     EXPLANATION
----------------------------------------------------------------------
  ^                        the beginning of a "line"
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    .*                       any character except \n (0 or more times
                             (matching the most amount possible))
----------------------------------------------------------------------
    [a-z]                    any character of: 'a' to 'z'
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    .*                       any character except \n (0 or more times
                             (matching the most amount possible))
----------------------------------------------------------------------
    [0-9]                    any character of: '0' to '9'
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  [a-z0-9!&#]*             any character of: 'a' to 'z', '0' to '9',
                           '!', '&', '#' (0 or more times (matching
                           the most amount possible))
----------------------------------------------------------------------
  $                        before an optional \n, and the end of a
                           "line"
----------------------------------------------------------------------