How do I manipulate character case in search and replace in vim?

问题

for example, I have:

  double foo = 0.0;  
  double bar = 0.0;

and I want to write some sort of search to find each variable and change it to:

  double Foo = 0.0;  
  double Bar = 0.0;

I dont want to do these one variable at a time (e.g. :%s/foo/Foo/g) but rather all at once, something close to

:%s/  double \(\w\+\)/  double \1/c 

(and somehow capitialize the first character of \1)

回答1:

Use the \u prefix for the match in the replace clause:

For one at a time:

:%s/ double \(\w\+\)/ double \u\1/c

For all at once:

:%s/ double \(\w\+\)/ double \u\1/g

If you want to make the whole match uppercase use the \U and \E delimiters:

:%s/ double \(\w\+\)/ double \U\1\E/g

回答2:

Use \u

%s/ double \(\w\+\)/ double \u\1/c

回答3:

Couldn't get the other's to work, this works for me:

:%s/\(double \)\<\(\w\)\(\w*\)\>/\1\u\2\L\3/g

回答4:

s:\(\<double\>\)\(\<\w\+\>\):\1 \u\2:g

or sume-such.

来源：https://stackoverflow.com/questions/10745694/how-do-i-manipulate-character-case-in-search-and-replace-in-vim