The following table lists some common regular expression special characters and examples. Multiple special characters can be used in the same expression to create more criteria. Note:Regular expression patterns are case sensitive. Case sensitivity can be controlled within a pattern using the inline modi...
The magical bits that we need to remove are: rules can have multiple characters in state transitions, rules can have "empty" state transitions, rules can have ambiguous state transitions, there can be situations for which no stated rule applies, and there's a magical 'cr...
Given the text 'text', the expression '</?t.*>' matches all characters between : 'text' exprq? Lazy expression: match as few characters as necessary. Given the text'text', the expression '</?t.*?>' ends each match at the first occurrence of the closing angle bracket (>): '' '...
A character class defines a set of characters, any one of which can occur in an input string for a match to succeed. The regular expression language in .NET supports the following character classes:Positive character groups. A character in the input string must match one of a specified set ...
that tokens for special symbols in regular expression patterns do not depend on a scripting language. However, to specify a replacement string that would hold multiple text lines, you should use language-specific notation of special characters. (SeeSpecial characterssection inWorking With Stringstopic...
Also, for more fun, here's another fiddle that generates the lousiest possible regular expression that still works, 1205306 characters long. It looks something like this: ^(01/01/1800|01/02/1800|01/03/1800|...|12/29/2099|12/30/2099|12/31/2099)$ Share Follow answered Aug 3, 2017...
(?!abc)matches zero characters only if they are not followed by the expressionabc. Alternatives Alternatives occur when the expression can match either one sub-expression or another, each alternative is separated by a ‘|’. Each alternative is the largest possible previous sub-expression; this ...
# This expression returns true if it matches a server name.# (Server-01 - Server-99).'Server-01'-match'Server-\d\d' Word characters The\wcharacter class matches any word character[a-zA-Z_0-9]. To match any non-word character, use\W. ...
A regular expression (REGEX) is a character sequence defining a search pattern. A REGEX pattern can consist of literal characters, such as “abc”, or special characters, such as “.”, “", “+”, “?”, and more. Special characters have special meanings and functions in REGEX. ...
Anchors, or atomic zero-width assertions, cause a match to succeed or fail depending on the current position in the string, but they do not cause the engine to advance through the string or consume characters. The metacharacters listed in the following table are anchors. For more information,...