How to change spaces to underscore and make string case insensitive?

Question

I have following question. In my app there is a listview. I get itemname from listview and transfer it to the webview as a string. How to ignore case of this string and change spaces to underscores?

For example: String itemname = "First Topic". I transfer it to the next activity and want to ignore case and change space to underscore (I want to get first_topic in result). I get "itemname" in webviewactivity and want to do what I've described for following code:

String filename = bundle.getString("itemname") + ".html"; 

Please, help.

Answer 1

use replaceAll and toLowerCase methods like this:

myString = myString.replaceAll(" ", "_").toLowerCase()

Answer 2

This works for me:

itemname = itemname.replaceAll("\\s+", "_").toLowerCase(); 

replaceAll("\\s+", "_") replaces consecutive whitespaces with a single underscore.

"first topic".replaceAll("\\s+", "_") -> first_topic

"first topic".replaceAll(" ", "_") -> first__topic