vim regex with meta-characters -

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I have text in a text file 

  For example this is some text cv_1 For example, this is some text for cv_001, for example this is some text for cv_15

I have to regex cv _ to match cv_1 *? Trying to use \ S , in the text cv_001, cv_15 I know that regex works though, when I try in VIM, then nothing like this matches.

Do we need to do something special in VIM?

Pearl non-greedy "?" Do not work in four Vim, you should use it: 

  cv _ \ {-} \ s

Instead 

  cv _ *? \ S

There are some quick references to the match: 

  * (0 or more) greedy matching \ + (1 or more) greedy matching \ { - (0 or more) Non greedy match {{- n,} (at least n) Non greedy match

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