基本上我需要一个正则表达式,如果字符串是一个单词(\ w +),它将返回true,如果它是单词word1或word2,则返回。
我尝试过很多东西,但不要以为我就差不多了。救命啊!
答案 0 :(得分:20)
答案 1 :(得分:2)
它是:
^(?!word1|word2)\w*
答案 2 :(得分:2)
要匹配由一个或多个字母,数字或下划线组成的任何单词(因为您提到要使用\w+
来匹配所有单词)除外 word1
和word2
,您可以将negative lookahead解决方案与word boundaries \b
结合使用:
\b(?!(?:word1|word2)\b)\w+
请参见regex demo。请注意,在PostgreSQL正则表达式中,\b
必须替换为\y
。
以下是一些快速的代码片段:
"""\b(?!(?:word1|word2)\b)\w+""".r.findAllIn(text).toList
(请参阅demo)text.findAll(/\b(?!(?:word1|word2)\b)\w+/)
(请参阅demo)Regex("""\b(?!(?:word1|word2)\b)\w+""").findAll(text).map{it.value}.toList()
(请参阅demo)select-string -Path $input_path -Pattern '\b(?!(?:word1|word2)\b)\w+' -AllMatches | % { $_.Matches } | % { $_.Value } > $output_file
std::regex rx(R"(\b(?!(?:word1|word2)\b)\w+)"); std::string s = "Extract all words but word1 and word2."; std::vector<std::string> results(std::sregex_token_iterator(s.begin(), s.end(), rx), std::sregex_token_iterator());
(请参阅demo)Dim matches() As String = Regex.Matches(text, "\b(?!(?:word1|word2)\b)\w+").Cast(Of Match)().Select(Function(m) m.Value).ToArray()
extension String {
func matches(regex: String) -> [String] {
do {
let regex = try NSRegularExpression(pattern: regex, options: [])
let nsString = self as NSString
let results = regex.matches(in: self, options: [], range: NSRange(location: 0, length: nsString.length))
return results.map { nsString.substring(with: $0.range) }
} catch let error {
print("invalid regex: \(error.localizedDescription)")
return []
}
}
}
print("Extract all words but word1 and word2.".matches(regex: #"\b(?!(?:word1|word2)\b)\w+"#))
text.match(/\b(?!(?:word1|word2)\b)\w+/g)
(请参阅demo)regmatches(text, gregexpr("(*UCP)\\b(?!(?:word1|word2)\\b)\\w+", text, perl=TRUE))
(请参阅demo)或stringr::str_extract_all(text, "\\b(?!(?:word1|word2)\\b)\\w+")
(请参阅demo)text.scan(/\b(?!(?:word1|word2)\b)\w+/)
(请参阅demo)Pattern p = Pattern.compile("(?U)\\b(?!(?:word1|word2)\\b)\\w+"); Matcher m = p.matcher(text); List<String> res = new ArrayList<>(); while(m.find()) { res.add(m.group()); }
(请参阅demo)if (preg_match_all('~\b(?!(?:word1|word2)\b)\w+~u', $text, $matches)) { print_r($matches[0]); }
(请参阅demo)re.findall(r"\b(?!(?:word1|word2)\b)\w+", text)
(请参阅demo)Regex.Matches(text, @"\b(?!(?:word1|word2)\b)\w+").Cast<Match>().Select(x=>x.Value)
(请参阅demo)grep -oP '\b(?!(?:word1|word2)\b)\w+' file
(demo)REGEXP_MATCHES(col, '\y(?!(?:word1|word2)\y)\w+', 'g')
(demo)@list = ($str =~ m/\b(?!(?:word1|word2)\b)(\w+)/g);
(demo)答案 3 :(得分:-7)
为什么要为此使用正则表达式?
的伪代码:
return (str != word1 AND str != word2)