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Regex.Replace Method (String, String, MatchEvaluator, RegexOptions)

Within a specified input string, replaces all strings that match a specified regular expression with a string returned by a MatchEvaluator delegate. Specified options modify the matching operation.

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

public static string Replace (
	string input,
	string pattern,
	MatchEvaluator evaluator,
	RegexOptions options
)
public static String Replace (
	String input, 
	String pattern, 
	MatchEvaluator evaluator, 
	RegexOptions options
)
public static function Replace (
	input : String, 
	pattern : String, 
	evaluator : MatchEvaluator, 
	options : RegexOptions
) : String
Not applicable.

Parameters

input

The string to search for a match.

pattern

The regular expression pattern to match.

evaluator

A custom method that examines each match and returns either the original matched string or a replacement string.

options

A bitwise OR combination of RegexOptions enumeration values.

Return Value

A new string that is identical to the input string, except that a replacement string takes the place of each matched string.

Exception typeCondition

ArgumentNullException

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

-or-

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

-or-

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

The pattern parameter consists of various regular expression language elements that symbolically describe the string to match. For more information about regular expressions, see .NET Framework Regular Expressions and Regular Expression Language Elements.

The evaluator parameter is the delegate for a custom method that you define and that examines each match. Your custom method returns a string that replaces the matched input.

If the options parameter specifies the RightToLeft enumeration value, the search for matches begins from the end of the input string and proceeds from right to left; otherwise, the search begins from the start of the input string and proceeds from left to right.

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

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