Jelly, 7 bytes
rAẇ@5ドルS
Input: Start, End, ToFind
How?
rAẇ@5ドルS - Main link: Start, End, ToFind
r - range: [Start, ..., End]
A - absolute values
5 - third input: ToFind
ẇ@€ - sublist exists in with reversed @rguments for €ach
S - sum
The default casting of an integer to an iterable for the sublist existence check casts to a decimal list (not a character list), so negative numbers have a leading negative value (e.g. -122->[-1,2,2] which won't find a sublist of [1,2]) so taking the absolute value first seems like the golfiest solution.
Jonathan Allan
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