How to format color of text

I would to like to write a script to find all specific words and format their color.

I tryied the following, but it seems it is not working:

function ChangeColor() {
  var body = DocumentApp.getActiveDocument().getBody();
  var myword = body.findText("var");

  while (myword !== null){
    var mysearch = myword.getElement().asText().setForegroundColor('#DC64DC');
  }
}

Can anyone help me, please?

You want to change the font color of "var" in the document. If my understanding is correct, how about this modification?

Modification points :

• In order to search next word, it uses findText(searchPattern, from).
• In order to change the color of "var", it uses setForegroundColor(startOffset, endOffsetInclusive, color).
  • In your script, the offset of start and end can be retrieved by myword.getStartOffset() and myword.getEndOffsetInclusive(), respectively.

Modified script :

function ChangeColor() {
  var searchValue = "var";
  var body = DocumentApp.getActiveDocument().getBody();
  var myword = body.findText(searchValue);

  while (myword) {
    var mysearch = myword.getElement().asText()
    mysearch.setForegroundColor(
      myword.getStartOffset(), // startOffset
      myword.getEndOffsetInclusive(), // endOffsetInclusive
      '#DC64DC' // color
    );
    var myword = body.findText(searchValue, myword); // Search next word
  }
}

References :

• findText(searchPattern, from)
• setForegroundColor(startOffset, endOffsetInclusive, color)

If I misunderstand your question, I'm sorry.