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squeeze 

        # String.squeeze

(from ruby core)
---
    str.squeeze([other_str]*)    -> new_str

---

Builds a set of characters from the *other_str* parameter(s) using the
procedure described for String#count. Returns a new string where runs of
the same character that occur in this set are replaced by a single
character. If no arguments are given, all runs of identical characters
are replaced by a single character.

    "yellow moon".squeeze                  #=> "yelow mon"
    "  now   is  the".squeeze(" ")         #=> " now is the"
    "putters shoot balls".squeeze("m-z")   #=> "puters shot balls"

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