TYPOSCRIPT stdWrap.replacement I Want to replace space with underscore _

My typo3 version is 10.4.22

lib.spaces = TEXT
lib.spaces {
   current = 1
   stdWrap.replacement {
       10 {
           search = 
           replace = _
           wrap = |
       }
   }
}

I have a following typoscript. And now my question is, what i have to write in search = ?
so that space is being searched and replace with underscore.

SORRY For my bad english!

>Solution :

replacement.search has stdWrap, so you can use char. The ascii code for space is 32, so that will make it:

lib.spaces = TEXT
lib.spaces {
   current = 1
   stdWrap.replacement {
       10 {
           search.char = 32
           replace = _
           wrap = |
       }
   }
}