JavaScript RegExp lastIndex Property

　JavaScript RegExp RegExp Object

lastIndexThis property defines the index to start the next match.

This property returns an integer that specifies the character position after the last match found by the exec() or test() method.

Both the exec() and test() methods will automatically reset lastIndex to 0 when no match is found.

Note:Only when the following setting is enabled: g This property takes effect only when the identifier (modifier) is specified.

Syntax:

regex.lastIndex

var str =39;The question is To be, or not to be, that is to be.';
var regex =　/to be/gi;
while (regex.test(str) == true) {
　　　document.write("'to be'　found.　Start the next match at index: "　+　regex.lastIndex);
　　　document.write("<br>");
}

Browser Compatibility

All browsers fully support the lastIndex property:

Technical Details

　JavaScript RegExp RegExp Object