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Basically I need a regex which will return true if the string is a word (\w+) EXCEPT if it is the word word1 OR word2.
I've tried many things but dont think I'm even close. Help!
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How do you ignore something in regex? To match any character except a list of excluded characters, put the excluded charaters between [^ and ] . The caret ^ must immediately follow the [ or else it stands for just itself.
To run a “whole words only” search using a regular expression, simply place the word between two word boundaries, as we did with ‹ \bcat\b ›. The first ‹ \b › requires the ‹ c › to occur at the very start of the string, or after a nonword character.
However, to recognize multiple words in any order using regex, I'd suggest the use of quantifier in regex: (\b(james|jack)\b. *){2,} . Unlike lookaround or mode modifier, this works in most regex flavours.
Definition and Usage. The ?! n quantifier matches any string that is not followed by a specific string n.
^(?!(?:word1|word2)$)\w+$
should do what you need.
(?!...) is a negative lookahead assertion that ensures that it is not possible to match the enclosed expression at the current position.
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There it is:
^(?!word1|word2)\w*
To match any word that is a sequence of one or more letters, digits or underscores (since you mention you want to match all words using \w+) except word1 and word2 you may use a negative lookahead solution with word boundaries \b:
\b(?!(?:word1|word2)\b)\w+
See the regex demo. Note that in PostgreSQL regex, \b must be replaced with \y.
Here are some quick code snippets:
"""\b(?!(?:word1|word2)\b)\w+""".r.findAllIn(text).toList (see demo)text.findAll(/\b(?!(?:word1|word2)\b)\w+/) (see demo)Regex("""\b(?!(?:word1|word2)\b)\w+""").findAll(text).map{it.value}.toList() (see 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()); (see 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) (see demo)regmatches(text, gregexpr("(*UCP)\\b(?!(?:word1|word2)\\b)\\w+", text, perl=TRUE)) (see demo) or stringr::str_extract_all(text, "\\b(?!(?:word1|word2)\\b)\\w+") (see demo)text.scan(/\b(?!(?:word1|word2)\b)\w+/) (see 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()); } (see demo)if (preg_match_all('~\b(?!(?:word1|word2)\b)\w+~u', $text, $matches)) { print_r($matches[0]); } (see demo)re.findall(r"\b(?!(?:word1|word2)\b)\w+", text) (see demo)Regex.Matches(text, @"\b(?!(?:word1|word2)\b)\w+").Cast<Match>().Select(x=>x.Value) (see 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)
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