LookaheadPattern Property

Gets or sets the regular expression pattern which is used to match the text following a token associated with the TerminalSymbol to determine if the token can actually be used or not.

Syntax

Visual Basic

'Declaration
 
Public Property LookaheadPattern As String

C#

public string LookaheadPattern {get; set;}

Exceptions

Exception	Description
System.InvalidOperationException	Occurs when the IsMutable value of the owning Grammar is False.
System.ArgumentException	Occurs when the specified value contains invalid regular expression elements.

Remarks

If LookaheadPattern is set, IsLookaheadNegative indicates whether the token should be used based on whether it can match the text following the token. If IsLookaheadNegative is True, the token will only be used if the LookaheadPattern cannot match the text after the token. If False, the token will only be used if the LookaheadPattern can match the text after the token.

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2