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Regex.IsMatch Method (String, Int32)

Indicates whether the regular expression specified in the Regex constructor finds a match in the input string beginning at the specified starting position in the string.

Namespace: System.Text.RegularExpressions
Assembly: System (in system.dll)

public bool IsMatch (
	string input,
	int startat
public boolean IsMatch (
	String input, 
	int startat
public function IsMatch (
	input : String, 
	startat : int
) : boolean
Not applicable.



The string to search for a match.


The character position at which to start the search.

Return Value

true if the regular expression finds a match; otherwise, false.

Exception typeCondition


input is a null reference (Nothing in Visual Basic).


startat cannot be less than zero or greater than the length of input.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0