I have done two syntax highlighter plugins (compactible for q2a express editor ) .
Yu can get it here . You can use either one of then which one you lie the most . Togather they are loaded with around 50 themes which you could configure from admin panel .
If you are looking for a cool code editor for your website - here is one for you http://www.question2answer.org/qa/37420
Hope you will like them .
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April 20, 2021: Q2A 1.8.6 released!