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SuperTester's avatar
SuperTester
Contributor
5 years ago

Extracting Image File Path from HTML Tag - Regular Expressions

Hello,   I am trying to come up with a regular expression that will match an image file path that is contained within a HTML tag.   <p><img src="file:///C:\Users\UserName\AppData\Local\Temp\ABC_I...
Scripting
  • BenoitB's avatar
    BenoitB
    5 years ago

    Yep, i've made a big mistake. As soon it's assigned it become a processed litteral and the \, as it is an escape char, doesn't exist anymore.

    No easy solution yet.

     

    You can try with the String.raw but the problem is the assignement of the value...

    https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/String/raw

     

     

     

    function getImagePath(HtmlTag, Extension = ".png") {
  let posStart = 8 + aqString.Find(HtmlTag, 'file:///', 0, false);                      // +8 to exclude 'file:///'
  let posEnd   = Extension.length + aqString.Find(HtmlTag, Extension, posStart, false); // To include the extension
  return HtmlTag.substr(posStart, posEnd-posStart);
}  

function testIt() {
  const htmlTag = String.raw`<p><img src="file:///C:\Users\UserName\AppData\Local\Temp\ABC_Image_DE_tp07165ac8_2b0c_44e2_a4d8_1deabe5fb73e.png" width = ""height = ""></p>`;
  Log.Message(getImagePath(`${htmlTag}`));
}

     

     

     

    In regex or string manipulations the problem exist as long as the \ is an escap char.

     

BenoitB's avatar
BenoitB
Community Hero
5 years ago

I like regex but sometimes simple text parsing is good too.

 

function getImagePath(HtmlTag, Extension = ".png") {
  let posStart = 8 + aqString.Find(HtmlTag, 'file:///', 0, false);                      // +8 to exclude 'file:///'
  let posEnd   = Extension.length + aqString.Find(HtmlTag, Extension, posStart, false); // To include the extension
  return HtmlTag.substr(posStart, posEnd-posStart);
}  

function testIt() {
  Log.Message(getImagePath('<p><img src="file:///C:\Users\UserName\AppData\Local\Temp\ABC_Image_DE_tp07165ac8_2b0c_44e2_a4d8_1deabe5fb73e.png" width = ""height = ""></p>'));
}

 

  • SuperTester's avatar
    SuperTester
    Contributor
    5 years ago

    Hey!

     

    Thank you very much for the solution! I appreciate the insight of changing from regex to parsing.

     

    One thing thats not quite right is that the result string is missing backslashes:

    C:UsersUserNameAppDataLocalTempABC_Image_DE_tp07165ac8_2b0c_44e2_a4d8_1deabe5fb73e.png

     

    I noticed during debugging that the HTML tag string also missing backslashes during test execution (see screen shot attached. Is this caused by the backslash being a escape character?

     

    Thanks again!

    • BenoitB's avatar
      BenoitB
      Community Hero
      5 years ago

      Yep, i've made a big mistake. As soon it's assigned it become a processed litteral and the \, as it is an escape char, doesn't exist anymore.

      No easy solution yet.

       

      You can try with the String.raw but the problem is the assignement of the value...

      https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/String/raw

       

       

       

      function getImagePath(HtmlTag, Extension = ".png") {
  let posStart = 8 + aqString.Find(HtmlTag, 'file:///', 0, false);                      // +8 to exclude 'file:///'
  let posEnd   = Extension.length + aqString.Find(HtmlTag, Extension, posStart, false); // To include the extension
  return HtmlTag.substr(posStart, posEnd-posStart);
}  

function testIt() {
  const htmlTag = String.raw`<p><img src="file:///C:\Users\UserName\AppData\Local\Temp\ABC_Image_DE_tp07165ac8_2b0c_44e2_a4d8_1deabe5fb73e.png" width = ""height = ""></p>`;
  Log.Message(getImagePath(`${htmlTag}`));
}

       

       

       

      In regex or string manipulations the problem exist as long as the \ is an escap char.