Capitalize first letter of each word in a selectio

问题:

In vim, I know we can use ~ to capitalize a single char (as mentioned in this question), but is there a way to capitalize the first letter of each word in a selection using vim?

For example, if I would like to change from

hello world from stackoverflow

to

Hello World From Stackoverflow

How should I do it in vim?

回答1:

You can use the following substitution:

s/\<./\u&/g

• \< matches the start of a word
• . matches the first character of a word
• \u tells Vim to uppercase the following character in the substitution string (&)
• & means substitute whatever was matched on the LHS

回答2:

:help case says:

To turn one line into title caps, make every first letter of a word
uppercase: >
    : s/\v<(.)(\w*)/\u\1\L\2/g

Explanation:

:                      # Enter ex command line mode.

space                  # The space after the colon means that there is no
                       # address range i.e. line,line or % for entire
                       # file.

s/pattern/result/g     # The overall search and replace command uses
                       # forward slashes.  The g means to apply the
                       # change to every thing on the line. If there
                       # g is missing, then change just the first match
                       # is changed.

The pattern portion has this meaning.

\v                     # Means to enter very magic mode.
<                      # Find the beginning of a word boundary.
(.)                    # The first () construct is a capture group. 
                       # Inside the () a single ., dot, means match any
                       #  character.
(\w*)                  # The second () capture group contains \w*. This
                       # means find one or more word caracters. \w* is
                       # shorthand for [a-zA-Z0-9_].

The result or replacement portion has this meaning:

\u                     # Means to uppercase the following character.
\1                     # Each () capture group is assigned a number
                       # from 1 to 9. \1 or back slash one says use what
                       # I captured in the first capture group.
\L                     # Means to lowercase all the following characters.
\2                     # Use the second capture group

Result:

ROPER STATE PARK
Roper State Park  

An alternate to the very magic mode:

    : % s/\<\(.\)\(\w*\)/\u\1\L\2/g
    # Each capture group requires a backslash to enable their meta
    # character meaning i.e. "\(\)" verses "()".

回答3:

The Vim Tips Wiki has a TwiddleCase mapping that toggles the visual selection to lower case, UPPER CASE, and Title Case.

If you add the TwiddleCase function to your .vimrc, then you just visually select the desired text and press the tilde character ~ to cycle through each case.

回答4:

Try This regex ..

s/ \w/ \u&/g

回答5:

There is also the very useful vim-titlecase plugin for this.