Day 19 – Regular Expression Matching In KRL

Sometimes in apps you want to check to see if a string is found in some text and react accordingly.

ruleset a60x511 {
  meta {
    name "Regex-match-test"
    description <<
    author "Mike Grace"
    logging on

  rule check_for_match {
    select when pageview ".*"
      emit <|
        $K(".stream-item").live("click", function() {
          app = KOBJ.get_application("a60x511");
          var tweetText = $K(this).find(".tweet-text").text();
          app.raise_event("check_clicked_tweet", {"tweetText":tweetText});

  rule check_clicked_tweet {
    select when web check_clicked_tweet
    pre {
      tweetText = event:param("tweetText");
      loveFound = tweetText.match(re/love/i);
      heart =<<
        <img src=""/>
    if (loveFound) then {
      notify("#{heart} Found Love in", tweetText) with sticky = true;
    notfired {
      raise explicit event love_not_found
        with tweetText = tweetText;

  rule love_not_found {
    select when explicit love_not_found
    pre {
      tweetText = event:param("tweetText");
      notify(": ( Love not found in", tweetText) with sticky = true;
  • 15 use jQuery ‘live’ function because new tweets load up on the page all the time
  • 15-19 when a tweet is clicked on get the text of the tweet and raise an event to process the text of the tweet
  • 25 select on web event of ‘check_clicked_tweet’
  • 27 get tweet text from raised event
  • 28 check to see if the word ‘love’ is found in the tweet using the match operator
  • 33 if the word ‘love’ is found the execute the action block
  • 36 if the action block did not execute because the word ‘love’ wasn’t found in the tweet then raise an explicit event ‘love_not_found’

Clicking on several tweets on after app was run with bookmarklet

Get the bookmarklet to try it out yourself!

Gratuitous day 19 Grace face

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