This regular expression as a C# string, becomes "\\\\". The regular expression \\ matches a single backslash. In regular expressions, the backslash is also an escape character. The literal string "\\" is a single backslash. NET languages, the backslash is an escape character. In literal C# strings, as well as in C++ and many other. Regular Expressions, Literal Strings and Backslashes This means you can work with several Match objects created by the same Regex object simultaneously. Note that after calling RegexObj.Match(), the resulting Match object is independent from RegexObj. You can continue calling MatchObj.NextMatch() until MatchObj.Success is False. To find the next match of the regular expression in the same subject string, call MatchObj.NextMatch() which returns a new Match object containing the results for the second match attempt. MatchObj.Groups("name") gets the details of the named group “name”. MatchObj.Groups(3).Length and MatchObj.Groups(3).Index get the length of the text matched by the group and its index in the subject string, relative to the start of the subject string. MatchObj.Groups(3).Value gets the text matched by the third pair of parentheses. The count includes the zeroth group, which is the entire regex match. indicates the number of capturing parentheses. If the regular expression contains capturing parentheses, use the MatchObj.Groups collection. The start of the match is zero-based, so it effectively counts the number of characters in the subject string to the left of the match. If so, use MatchObj.Value to get the contents of the match, MatchObj.Length for the length of the match, and MatchObj.Index for the start of the match in the subject string. MatchObj.Success indicates if there actually was a match. If not, use the static version: Dim MatchObj as Match = Regex.Match("subject", "regex").Įither way, you will get an object of class Match that holds the details about the first regex match in the subject string. If you instantiated a Regex object, use Dim MatchObj as Match = RegexObj.Match("subject"). If you want more information about the regex match, call Regex.Match() to construct a Match object. All these methods accept an optional additional parameter of type RegexOptions, like the constructor. Regex.Split("subject", "regex") splits the subject string into an array of strings as described above. Regex.Replace("subject", "regex", "replacement") performs a search-and-replace. Regex.IsMatch("subject", "regex") checks if the regular expression matches the subject string. All the static methods have the same names (but different parameter lists) as other non-static methods. Note that member overloading is used a lot in the Regex class.
#REGULAR EXPRESSION NOT CASE SENSITIVE RUBY CODE#
This reduces the amount of code you have to write, and is appropriate if the same regular expression is used only once or reused seldomly. The Regex class also contains several static methods that allow you to use regular expressions without instantiating a Regex object. If you want the entire regex matches to be included in the array, simply place parentheses around the entire regular expression when instantiating RegexObj. If the regex contains capturing parentheses, the text matched by them is also included in the array. The array contains the text between the regex matches. RegexObj.Split("Subject") splits the subject string along regex matches, returning an array of strings. Improper use of the $ sign may produce an undesirable result string, but will never cause an exception to be raised. NET Framework 1.x compared with later versions. There are a few differences between the regex flavor in the. There are no differences between this flavor and the flavor supported by any version of. There are no differences in the regex flavor supported by the. The only noteworthy features that are lacking are possessive quantifiers and subroutine calls. NET programming language such as C# (C sharp) or Visual Basic.NET, has solid support for regular expressions.NET’s regex flavor is very feature-rich. Using Regular Expressions with Microsoft.
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