leftContext Property ($`) (Windows Scripting - JScript)

 

Returns the characters from the beginning of a searched string up to the position before the beginning of the last match. Read-only.

Syntax

RegExp.leftContext

Remarks

The object associated with this property is always the global RegExp object.

The initial value of the leftContext property is an empty string. The value of the leftContext property changes whenever a successful match is made.

The following example illustrates the use of the leftContext property:

   // Create the regular expression pattern.
   var re = new RegExp("d(b+)(d)","ig");
   var str = "cdbBdbsbdbdz";

   // Perform the search.
   var arr = re.exec(str);

   // Print the output.
   var s = "" 
   s += "$1: " + RegExp.$1 + "<br />";
   s += "$2: " + RegExp.$2 + "<br />";
   s += "$3: " + RegExp.$3 + "<br />";
   s += "input: " + RegExp.input + "<br />";
   s += "lastMatch: " + RegExp.lastMatch + "<br />";
   s += "leftContext: " + RegExp.leftContext + "<br />";
   s += "rightContext: " + RegExp.rightContext + "<br />"; 
   s += "lastParen: " + RegExp.lastParen + "<br />";

   document.write(s);

Requirements

Version 5.5

Applies To: RegExp Object (Windows Scripting - JScript)

Change History

Date	History	Reason
March 2009	Modified example.	Information enhancement.

See Also

$1...$9 Properties (Windows Scripting - JScript)
index Property (Windows Scripting - JScript)
input Property ($_) (Windows Scripting - JScript)
lastIndex Property (Windows Scripting - JScript)
lastMatch Property ($&) (Windows Scripting - JScript)
lastParen Property ($+) (Windows Scripting - JScript)
rightContext Property ($') (Windows Scripting - JScript)