Feature Request: Preserve Case - Find / Replace

[shaneparsons]

It'd be awesome if a preserve case feature was eventually added to the find/replace functionality!

ST3's implementation of it is a good example if you need one.

[peabnuts123]

This would be life-changing

[axefrog]

Example: currently implementing an immutable red/black tree, and there is an if/else statement, with each branch containing a mirror of the other branch. To implement the second branch, I need to replace all instances of "left" with "right" and vice versa. This includes:

• left/right (local variable)
• Left/Right (part of a function name)
• LEFT/RIGHT (a constant indicating branch direction)

A case-insensitive replacement operation would make this doable in one step. Instead, I have to first replace each case of left with foo (3 steps). Next I replace each case of right with left (3 more steps). Finally, I replace foo with right, for a total of 9 steps. With case insensitive replacement, it'd be 3 steps total.

[rebornix]

Let's track the setting persistence in #6158

[ant31]

@rebornix I think this is not a duplicated issue.
The issue #6158 is about 'saving' the setting.
This issue (from what I read) is about keeping the case for the replaced word (default in emacs)
eg:

foo-bar
FOO-BAR
Foo-Bar

// find: foo-bar
// replace: keep-case
keep-case
KEEP-CASE
Keep-Case

[axefrog]

@ant31 The feature is/would be per-character, not per word, which means your example would resolve as:

// find: foo-bar
// replace: keep-case
keep-case
KEEP-CAse
Keep-case