If you want to match the entire string where you want to match everything but certain strings you can do it like this: ^(?!(red|green|blue)$).*$ This says, start the match from the beginning of the string where it cannot start and end with red, green, or blue and match anything...
In regex, we can match any character using period “.” character. To match only a given set of characters, we should use character classes. In this Regular expression tutorial, learn to match a single character appearing once, a single character appearing multiple times, or a specific set o...
where the e's are the empty strings. The regex (?!hede). looks ahead to see if there's no substring "hede" to be seen, and if that is the case (so something else is seen), then the . (dot) will match any character except a line break. Look-arounds are also called zero-widt...
A bitwise combination of the enumeration values that provide options for matching. matchTimeout TimeSpan A time-out interval, orInfiniteMatchTimeoutto indicate that the method should not time out. Returns Boolean trueif the regular expression finds a match; otherwise,false. ...
The following example illustrates the use of the IsMatch(String, String) method to determine whether a string is a valid part number. The regular expression assumes that the part number has a specific format that consists of three sets of characters separated by hyphens. The first set, which ...
To Reproduce create a native question in MongoDB like [ {"$match": { "source": { "$regex": {{source}}, "$options": "i" } } }, { "$project": { "_id": "$_id", "address": "$address", "email": "$email", "password": "$password", "name": "$name", "city": "$cit...
REGEX is a powerful and flexible way to search for and match patterns in text strings. You can use REGEX to perform various tasks, such as: Extracting specific information from a text string, such as names, dates, numbers, etc. Replacing parts of a text string with another text string, ...
string[] substrings = regex.Split("plum--pear"); foreach (string match in substrings) { Console.WriteLine("'{0}'", match); } } } // The example displays the following output: // 'plum' // '' // 'pear' 如果在输入字符串的开头或末尾找到匹配项,则返回的数组的开头或末尾将包含一...
The regular expression above can accept the stringsjohn_doe,jo-hn_doeandjohn12_as. It does not matchJobecause that string contains an uppercase letter and also it is too short. Table of Contents 1. Basic Matchers A regular expression is just a pattern of characters that we use to perform...
In a specified input substring, replaces a specified maximum number of strings that match a regular expression pattern with a string returned by aMatchEvaluatordelegate. Replace(String, MatchEvaluator, Int32) In a specified input string, replaces a specified maximum number of strings that match a...