Question

I’m am using JEditorPane to render basic HTML. But it renders self-closing tags incorrectly, specifically br tags, e.g. <br /> is bad but <br> is good. I would like to use String.replaceAll(regex, “<br>”) to fix the HTML, where regex is a regular expression matching any self-closing br tag with case-insensitivity and zero to infinity number of spaces between the “r” and the “/” (e.g., <br/>, <BR/>, <br />, <Br     />, etc.).

Thanks to any regular expression experts who can solve this!

Answer 1

You can use the regex:

<[bB][rR]\s*/>

• < : To match a literal <
• [bB] : A char class that matches
  either b or B
• [rR] : A char class that matches
  either r or R
• \s : Any one white space
• \s* : zero or more white spaces.

If you want to allow only a space for a white space you can use:

<[bB][rR] */>