[英]C# RegEx to find a specific string or all words in a string
Looking it up, I thought I understood how to look up a string of multiple words in a sentence, but it does not find a match. 抬起头来,我以为我理解如何在一个句子中查找多个单词的字符串,但它找不到匹配项。 Can someone tell me what I am doing wrong?
有人能告诉我我做错了什么吗? I need to be able to find a single or multiple word match.
我需要能够找到单个或多个单词匹配。 I passed in "to find" to the method and it did not find the match.
我通过“找到”方法,但没找到匹配。 Also, if the user does not enclose their search phrase in quotes, I also need it to search on each word entered.
此外,如果用户没有将其搜索短语括在引号中,我还需要它来搜索输入的每个单词。
var pattern = @"\b\" + searchString + @"\b"; //searchString is passed in.
Regex rgx = new Regex(pattern);
var sentence = "I need to find a string in this sentence!";
Match match = rgx.Match(sentence);
if (match.Success)
{
// Do something with the match.
}
Just remove the second \\
in the first @"\\b\\"
: 只需删除第一个
@"\\b\\"
中的第二个\\
:
var pattern = @"\b" + searchString + @"\b";
^
See IDEONE demo 请参阅IDEONE演示
Note that in case you have special regex metacharacters (like (
, )
, [
, +
, *
, etc.) in your searchString
s, you can use Regex.Escape()
to escape them: 请注意,如果您的
searchString
有特殊的正则表达式元字符(如(
, )
, [
, +
, *
等),则可以使用Regex.Escape()
来转义它们:
var pattern = @"\b" + Regex.Escape(searchString) + @"\b";
And if those characters may appear in edge positions, use lookarounds rather than word boundaries: 如果这些字符可能出现在边缘位置,请使用外观而不是字边界:
var pattern = @"(?<!\w)" + searchString + @"(?=\w)";
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