【问题标题】：Regular Expressions in ios(a word a letter and special characters)ios中的正则表达式（一个单词一个字母和特殊字符）
【发布时间】：2016-06-01 20:43:05
【问题描述】：

在下面的方法中，如果：它包含一个或多个英文单词，以及一个或多个数字，并且 let 可选地包含特殊字符(!@$) 返回真，否则返回假。

#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

【问题讨论】：

您的问题是什么？你只需要显示单词或数字吗？
您实际上不允许使用 0 个或多个符号。使用@"^[a-zA-Z0-9\\u0021\\u0040\\u0023\\u0024\\u0026]*$"。如果要确保有一个字母和一个数字，请使用@"^(?=[^a-zA-Z]*[a-zA-Z])(?=\\D*\\d)[a-zA-Z0-9\\u0021\\u0040\\u0023\\u0024\\u0026]*$"

标签： ios objective-c regex nsregularexpression

【解决方案1】：

说明

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

此正则表达式将执行以下操作：

(?=.*[a-z]) 要求字符串至少包含一个a-z 字符
(?=.*[0-9]) 要求字符串至少包含一个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

示例

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"
----------------------------------------------------------------------

【讨论】：