正则表达式查找以特定字符开头的单词
[英]Regex to find words that start with a specific character
问题描述
I am trying to find words starts with a specific character like: 
我试图找到一个特定字符开头的单词，如：
Lorem ipsum #text Second lorem ipsum.
I need to get all words starts with "#". 我需要用“＃”开头所有单词。 so my expected results are #text, #are, #else 所以我的预期结果是＃text，＃are，＃else
Any ideas? 有任何想法吗？
5 个解决方案
解决方案1
35 已采纳 2010-04-20 21:15:07
Search for: 搜索：
- something that is not a word character then 那些不是单词字符的东西
- # ＃
- some word characters 一些单词字符
So try this: 试试这个：
/(?<!\w)#\w+/
Or in C# it would look like this: 或者在C＃中它看起来像这样：
string s = "Lorem ipsum #text Second lorem ipsum. How #are You. It's ok. Done. Something #else now.";
foreach (Match match in Regex.Matches(s, @"(?<!\w)#\w+"))
{
Console.WriteLine(match.Value);
}
Output: 输出：
#text
#are
#else
解决方案2
12 2010-04-20 21:16:57
试试这个#(\\S+)\\s?
解决方案3
3 2010-04-20 21:15:56
Match a word starting with # after a white space or the beginning of a line. 在空格或行的开头后匹配以＃开头的单词。 The last word boundary in not necessary depending on your usage. 根据您的使用情况，不需要最后一个单词边界。
/(?:^|\s)\#(\w+)\b/
The parentheses will capture your word in a group. 括号将在组中捕获您的单词。 Now, it depends on the language how you apply this regex. 现在，它取决于您如何应用此正则表达式的语言。
The (?:...) is a non-capturing group. (?:...)是非捕获组。
解决方案4
0 2019-03-17 15:19:32
To accommodate different languages I have this (PCRE/PHP): 为了适应不同的语言，我有这个（PCRE / PHP）：
'~(?<!\p{Latin})#(\p{Latin}+)~u'
or 要么
$language = 'ex. get form value';
'~(?<!\p{' . $language . '})#(\p{' . $language . '}+)~u'
or to cycle through multiple scripts 或循环使用多个脚本
$languages = $languageArray;
$replacePattern = [];
foreach ($languages as $language) {
$replacePattern[] = '~(?<!\p{' . $language . '})#(\p{' . $language . '}+)~u';
}
$replacement = '<html>$1</html>';
$replaceText = preg_replace($replacePattern, $replacement, $text);
\\w works great, but as far as I've seen is only for Latin script. \\w效果很好，但据我所见，仅适用于拉丁文字。
Switch Latin for Cyrillic or Phoenician in the above example. 在上面的例子中切换Latin为Cyrillic或Phoenician 。
The above example does not work for 'RTL' scripts. 上面的示例不适用于'RTL'脚本。
解决方案5
0 2019-07-11 09:52:45
Code below should solve the case. 以下代码应解决此案。
-
/\\$(\\w)+/gSearches for words that starts with$/\\$(\\w)+/g搜索以$开头的单词 -
/#(\\w)+/gSearches for words that starts with#/#(\\w)+/g搜索以#开头的单词
The answer /(?<!\\w)#\\w+/ given by Mark Bayers throws a warning like below on RegExr.com website Mark RegExr.com给出的答案/(?<!\\w)#\\w+/在RegExr.com网站上发出如下警告
"(?<!" The "negative lookbehind" feature may not be supported in all browsers.
the warning can be fixed by changing it to (?!\\w)@\\w+ by removing > 可以通过删除>将警告更改为(?!\\w)@\\w+来修复警告
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