JavaScript regex on textarea input -


i trying extract ip addresses apache log file input in textarea field. using regular expressions extracting ip addresses. want see ip addresses printed on screen. cannot understand doing wrong. kindly help

<!doctype html> <html lang="en"> <head>  <meta charset="utf-8"> <title>regex_example</title> </head> <body style = "background-color: lightgrey"> <center> <h3><u>log miner</u></h3> <br /><hr /> <h5>paste apache log file in box below , click on mine!</h5>  <textarea  rows="25" cols="200" form="mine_log" id = "logs">  </textarea>  <form id = "mine_log" method = "" onsubmit="parselogs(document.getelementbyid('logs').value)">     <input type = "submit" value = "mine!!" /> </form> <script language="javascript" type="text/javascript">     function parselogs(text) {         var re = new regexp("^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$");         var myarray = re.exec("text");         document.write(myarray.tostring());      } </script> </center> </body> </html>

you need to:

  • use regex literal avoid double backslash escaping shorthand classes (right now, "\." translates .)
  • remove anchors pattern (i.e. ^ , $)
  • add global modifier regex (/g)
  • use string#match() regex (in case not need values captured capturing groups, else, need run regexp#exec inside loop collect those).

function parselogs(text) {     var re = /([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/g;     var myarray = text.match(re);     document.write("<pre>"+json.stringify(myarray, 0, 4) + "</pre>");  }
<h5>paste apache log file in box below , click on mine!</h5>    <textarea  rows="5" cols="200" form="mine_log" id = "logs">  12.34.56.76   45.45.34.24  </textarea>  <form id = "mine_log" method = "" onsubmit="parselogs(document.getelementbyid('logs').value)">      <input type = "submit" value = "mine!!" />  </form>

note in case need no captured values, may remove ( , ) pattern.


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