Markdown: Only escape special characters where necessary

[adamerose]

The characters * _ < [ ] \ always get escaped even when they don't need to be.

Example

Paste the following in the editor here then open Source view.

Input

These stay unchanged
~ ! @ # $ % ^ & ( ) + { } | : " > ? - = ; ' , . /
These get escaped unnecessarily
_ < [ ] \ *

Output

These stay unchanged  
~ ! @ # $ % ^ & ( ) + { } | : " > ? - = ; ' , . /  
These get escaped unnecessarily  
\_ \< \[ \] \\ \*

[movahhedi]

Oh this is soooo annoying

[CKEditorBot]

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[movahhedi]

Still annoying.