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Showing content from https://webplatform.github.io/docs/javascript/RegExp/1_9_Properties below:

1...9 Properties · WebPlatform Docs

Return the nine most-recently memorized portions found during pattern matching. Read-only.

RegExp.$ n

'RegExp’

Always the global RegExp object.

n

Any integer from 1 through 9.

The following example performs a regular expression search. It displays matches and submatches from the global RegExp object. The submatches are successful parenthesized matches that are contained in the … properties. The example also displays matches and submatches from the array that is returned by the exec method.

var newLine = "<br />";

 var re = /(\w+)@(\w+)\.(\w+)/g
 var src = "Please send mail to george@contoso.com and someone@example.com. Thanks!"

 var result;
 var s = "";

 
 result = re.exec(src);

 while (result != null) {
     
     s += newLine;

     
     s += "RegExp.lastMatch: " + RegExp.lastMatch + newLine;
     s += "RegExp.: " + RegExp. + newLine;
     s += "RegExp.: " + RegExp. + newLine;
     s += "RegExp.: " + RegExp. + newLine;

     
     
     for (var index = 0; index < result.length; index++) {
         s +=  index + ": ";
         s += result[index];
         s += newLine;
     }

     
     result = re.exec(src);
 }
 document.write(s);

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 

The values of the $1…$9 properties are modified whenever a successful parenthesized match is made. Any number of parenthesized substrings may be specified in a regular expression pattern, but only the nine most recent can be stored.

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