If you're running an ad blocker, consider whitelisting regex101 to support the website.Read more. Explanation / (go)+ / gmi 1st Capturing Group (go)+ +matches the previous token betweenoneandunlimitedtimes, as many times as possible, giving back as needed(greedy) ...
A REGEX pattern can also contain groups enclosed by parentheses “( )”. Groups can be used to capture parts of the matched text, or to apply quantifiers or modifiers to the whole group. For example, “(ab)+” matches one or more occurrences of “ab”, and “(\d{3})-(\d{4})”...
\s+Match one or more white-space characters. (car)Match the literal string "car". This is the second capturing group. Remarks TheMatch(String)method returns the first substring that matches a regular expression pattern in an input string. For information about the language elements used to bui...
+ Environment.MachineName + Match the string that is returned by the Environment.MachineName property. (?:\.\w+)* Match the period (.) character followed by one or more word characters. This match can occur zero or more times. The matched subexpression is not captured. \\ Match a backsl...
Regular expressions are used to replace text within a string, validate forms, extract a substring from a string based on a pattern match, and so much more. The term "regular expression" is a mouthful, so you will usually find the term abbreviated to "regex" or "regexp". Imagine you ...
-or- pattern is nulla null reference (Nothing in Visual Basic). Remarks The IsMatch method is typically used to validate a string or to ensure that a string conforms to a particular pattern without retrieving that string for subsequent manipulation. To determine whether one or more strings...
x? Zero or one of x (greedy) x*? Zero or more of x (ungreedy/lazy) x+? One or more of x (ungreedy/lazy) x?? Zero or one of x (ungreedy/lazy) x{n,m} At least n x and at most m x (greedy) x{n,} At least n x (greedy) x{n} Exactly n x x{n,m}? At least...
+ Environment.MachineName + Match the string that is returned by the Environment.MachineName property. (?:\.\w+)* Match the period (.) character followed by one or more word characters. This match can occur zero or more times. The matched subexpression is not captured. \\ Match a backsl...
Zero or more of a a* One or more of a a+ Exactly 3 of a a{3} 3 or more of a a{3,} Between 3 and 6 of a a{3,6} Start of string ^ End of string $ A word boundary \b Non-word boundary \B Regular Expression No Match ...
trueif a match exists. falseif a match doesn't exist. MongoDB uses Perl compatible regular expressions (i.e. "PCRE" ) version 8.41 with UTF-8 support. Prior to MongoDB 4.2, aggregation pipeline can only use the query operator$regexin the$matchstage. For more information on using regex ...