expandBackUntil abstract method
- Characters target
Expands the range to include characters back until the previous
If there is an occurrence of
target in the characters preceding
the current range, the start of the the range is moved to just after
the last such occurrence.
If there is no such occurrence of
target, the end of the range is
moved to the end of source.
true if there is an occurrence of
false if not.
bool expandBackUntil(Characters target);