Question

I got rather long sql script where all keyword are uppercase. I want to change them to lowercase, but preserve exact values of string literals and my own identifers.
For example, in this text:

KEYWORD BEFORE 'SOME STRING LITERAL' KEYWORD AFTER
mixedCaseValue  
MY_OWN_VARAIBLE
UGLY APPERCASE KEYWORDS, other text

I want only ‘KEYWORD BEFORE’, ‘KEYWORD AFTER’ and last ‘UGLY UPPERCASE KEYWORDS’ to be lowercase and all other left intact.
If I use something like this :%s/\<\u\+\>/\L&/g, text inside quotes on the first line is also affected.

Do you have any ideas?

Answer 1

Assuming that string literals do not span over multiple lines, and that there is
no syntax for escaping single quotes inside string literals, I would use the
following substitution command.

:%s/\%(^\%([^']*'[^']*'\)*\)\@<=[^']\+/\=substitute(submatch(0),'\<\u\+\>','\L&','g')/g