Changing caMelCase to lowercase_underscore

[Frans Grotepass]

Hi, I have a number of functions that I need to change from camelCase to
lowercase_undersore notation (Migrating code to coding guidelines).

How can I do a search and replace for something like this? the camelCase
functions all start with a lowercase character.

Best regards,

Frans

[Andy Wokula]

Frans Grotepass schrieb:

This makes it easy, see below.

> Best regards,
>
> Frans

Try this substitute
:%s/\l\zs\u/_\l&/gc

search for a lower case followed by an upper case char
let the match start at the upper case char

replace with "_" followed by the matched char turned into lower case
:h sub-replace-special
:h :s_flags

--
Andy