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skip_until 

        # StringScanner.skip_until

(from ruby core)
---
    skip_until(pattern)

---

Advances the scan pointer until `pattern` is matched and consumed. 
Returns the number of bytes advanced, or `nil` if no match was found.

Look ahead to match `pattern`, and advance the scan pointer to the *end*
of the match.  Return the number of characters advanced, or `nil` if the
match was unsuccessful.

It's similar to #scan_until, but without returning the intervening
string.

    s = StringScanner.new("Fri Dec 12 1975 14:39")
    s.skip_until /12/           # -> 10
    s                           #

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