bug#32365: Interactive Highlighting: prefix arg as subexp selector

[Grégory Mounié]

 Dear Maintainers,

 I propose to use the prefix argument in Interactive Highlighting.
 (the interactive function highlight-regexp)

 Without prefix all should stay identical.

 The numeric argument give the subexpression number of the regexp that 
is highlighted by font_lock or overlay.

 This allows to highlight

  - the 80th char of every line  C-u 1 M-s h r  and regexp ^.\{79\}\(.\)

  - the 6th column of a clean CSV file  C-u 1 M-s h r and regexp 
^\(?:[^,]*,\)\{5\}\([^,]*\),

  (clean CSV == with enough coma as you get multi-line matching with 
this regexp)

 I am not fluent with interactive stuff.
 I am not sure either how to treat errors.

 Have a nice day.
 Grégory Mounié


PS: Sorry for generating noise with my previous patch (BUG: 32362)

0001-Interactive-Highlighting-prefix-argument-to-select-s.patch
Description: Text Data