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the original pattern exhibits can take indeterminate time on long
input strings. The semantics of:
can be described as: "at least one non-space, followed by a colon,
optional whitespace and at least one non-space".
but the captures are not used in the code, and the match isn't
anchored at either end, so the pattern:
matches and rejects the same sets of strings and executes in
linear time. The time to reject the text reported in #26 (200000
chars in length) drops from 150secs to 2msec.