Get a simliar string a discharge the rest

Question

Hey guys,

wonder if you could help me out with some Javascript. I have a string that is log message, and i'm waniting to grab a section out of this log and display that on it's own

eg.(bear in mind the log section is not case sesitive and any letter can be any case, also could be placed anywhere withing the string)

$LOG: 08880xbpnd $ fhdsafidsfsd df sd fsd f sd fsd

thats the orignal log, Im wanting to grab the 08880xbpnd and get rid of the rest? how can this be done in javascript?

thanks for the help matt

edit

if this is any help i have this regex in perl that grabs the log somewhere else

/(?i)\$LOG:\s*(none|(temp(GD|MD)(.\d{1,2}){4}))\s*\$/

basically what ever in between $LOg: and $ i want to grab and exclude any white space that value in between could be anything or that above

Answer 1

Matthew,

the following regex should give you anything between $LOG: and $ in backreference \1

\$LOG:(.*?)\$

Answer 2

This works for me :

<script type="text/javascript">
  // Call the function with a sample input string.
  GetMyLog("$LOG: 08880xbpnd $ fhdsafidsfsd df sd fsd f sd fsd");

  function GetMyLog(fullString)
  {
    // Create a Regex object. We want to capture all word-like characters within the $LOG and ending $
    // This assumes that there will not be any more "$" characters in the trailing string.
    var reg = /\$LOG:\s*([\w]+)\s*\$/;

    // If the match attempt was successful, we need to get the second value in the array returned by the match.
    if (fullString.match(reg))
    {
      alert(reg.exec(fullString)[1]);
    }
  }
</script>

Answer 3

I would use this regular expression:

/\$LOG:([^$]+)\$/i

So:

"$LOG: 08880xbpnd $ fhdsafidsfsd df sd fsd f sd fsd".match(/\$LOG:([^$]+)\$/i)

Answer 4

I won't use regex, your case is simple and, maybe, using substring you can obtain a gain in speed.

Try using something like this:

function getToken(logline, startTag, endTag) {
  return logline.substring(startTag.length,logline.indexOf(endTag,1));
}

new version in response of a comment:

function getToken(logline, startTag, endTag) {
  result =""; 
  if ( logline.indexOf(startTag)>=0) 
    result= logline.substring(startTag.length,logline.indexOf(endTag,1));
  return result;  
}