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partition 

        # String.partition

(from ruby core)
---
    str.partition(sep)              -> [head, sep, tail]
    str.partition(regexp)           -> [head, match, tail]

---

Searches *sep* or pattern (*regexp*) in the string and returns the part
before it, the match, and the part after it. If it is not found, returns
two empty strings and *str*.

    "hello".partition("l")         #=> ["he", "l", "lo"]
    "hello".partition("x")         #=> ["hello", "", ""]
    "hello".partition(/.l/)        #=> ["h", "el", "lo"]

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