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regex - Capitalize first letter of each word in a selection using Vim

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 this

hello world from stack overflow

to

Hello World From Stack Overflow

how should I do it in Vim?

See Question&Answers more detail:os

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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 left-hand side
  • g means substitute all matches, not only the first

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