ios中的正则表达式（一个字母和特殊字符）

Question

在下面的方法中，我想检查 UITextField Text if：＆＃xA;它包含一个或多个英文单词，以及一个或多个数字，并且可选地包含特殊字符（！@ $＆amp;＃）＆＃xA;返回true，否则返回false。

＆＃xA;＆＃xA;

  #define pattern @“^ [a-zA-Z0-9 \\ u0021 \\ u0040 \\ u0023 \\ u0024 \\ u0026] {1} * $“＆＃xA;＆＃xA;  - （BOOL）stringHasCorrectFormat：（NSString *）str {＆＃xA;＆＃xA; if（[str componentsSeparatedByString：SPACE] .count＆gt; 1）＆＃xA;返回NO;＆＃xA; NSString * regularPattern = EMPTY_STRING;＆＃xA; regularPattern = [regularPattern stringByAppendingString：pattern]＆＃xA; NSRegularExpression * regex = [NSRegularExpression＆＃xA; regularExpressionWithPattern：regularPattern＆＃XA;选项：NSRegularExpressionCaseInsensitive＆＃XA;误差：无];＆＃XA;＆＃XA;＆＃XA;＆＃XA; NSTextCheckingResult * match = [regex＆＃xA; firstMatchInString：STR＆＃XA;选项：0＆＃XA; range：NSMakeRange（0，[str length]）];＆＃xA;＆＃xA;＆＃xA; if（match！= nil）{＆＃xA;返回YES;＆＃xA; }＆＃XA;＆＃XA;返回NO;＆＃xA;}＆＃xA;  

＆＃xA;＆＃xA;

谢谢

＆＃xA;

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个字符，0-9字符和!@$&#符号
组成

实施例

现场演示

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

解释

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