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如果不匹配则替换字符

发布于 2024-10-08 02:26:07 字数 148 浏览 4 评论 0原文

我正在寻找一个删除非法字符的正则表达式。但我不知道角色会是什么。

例如：

在一个进程中，我希望我的字符串匹配 ([a-zA-Z0-9/-]*)。所以我想替换所有不匹配上面的正则表达式的字符。

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甜是你 2024-10-15 02:26:07

这将是：

[^a-zA-Z0-9/-]+

字符类开头的 [^ ] 否定它 - 它匹配不在该类中的字符。

另请参阅：字符类

That would be:

[^a-zA-Z0-9/-]+

[^ ] at the start of a character class negates it - it matches characters not in the class.

See also: Character Classes

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深空失忆 2024-10-15 02:26:07

感谢 Kobi 的回答，我创建了一个用于删除不接受字符的辅助方法。

允许的模式应采用正则表达式格式，期望它们包含在方括号中。函数将在打开方括号后插入波浪号。
我预计它不适用于描述有效字符集的所有正则表达式，但它适用于我们正在使用的相对简单的集。

/// <summary>
/// Replaces  not expected characters.
/// </summary>
/// <param name="text"> The text.</param>
/// <param name="allowedPattern"> The allowed pattern in Regex format, expect them wrapped in brackets</param>
/// <param name="replacement"> The replacement.</param>
/// <returns></returns>
/// //        https://stackoverflow.com/questions/4460290/replace-chars-if-not-match.
//https://stackoverflow.com/questions/6154426/replace-remove-characters-that-do-not-match-the-regular-expression-net
//[^ ] at the start of a character class negates it - it matches characters not in the class.
//Replace/Remove characters that do not match the Regular Expression
static public string ReplaceNotExpectedCharacters( this string text, string allowedPattern,string replacement )
{
  allowedPattern = allowedPattern.StripBrackets( "[", "]" );
  //[^ ] at the start of a character class negates it - it matches characters not in the class.
  var result = Regex.Replace(text, @"[^" + allowedPattern + "]", replacement);
  return result; //returns result free of negated chars
}

Thanks to Kobi's answer I've created a helper method to strips unaccepted characters .

The allowed pattern should be in Regex format, expect them wrapped in square brackets. A function will insert a tilde after opening squere bracket.
I anticipate that it could work not for all RegEx describing valid characters sets,but it works for relatively simple sets, that we are using.

/// <summary>
/// Replaces  not expected characters.
/// </summary>
/// <param name="text"> The text.</param>
/// <param name="allowedPattern"> The allowed pattern in Regex format, expect them wrapped in brackets</param>
/// <param name="replacement"> The replacement.</param>
/// <returns></returns>
/// //        https://stackoverflow.com/questions/4460290/replace-chars-if-not-match.
//https://stackoverflow.com/questions/6154426/replace-remove-characters-that-do-not-match-the-regular-expression-net
//[^ ] at the start of a character class negates it - it matches characters not in the class.
//Replace/Remove characters that do not match the Regular Expression
static public string ReplaceNotExpectedCharacters( this string text, string allowedPattern,string replacement )
{
  allowedPattern = allowedPattern.StripBrackets( "[", "]" );
  //[^ ] at the start of a character class negates it - it matches characters not in the class.
  var result = Regex.Replace(text, @"[^" + allowedPattern + "]", replacement);
  return result; //returns result free of negated chars
}

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