Linus Groh 8284f87867 LibRegex: Add bounds check to Lexer::back() ...

If the offset is zero and we're already at the end of the lexer's input
an out of bounds read (m_source[m_position]) would occur.
Also check that the offset is not more than m_position (which should
never be the case, and would result in m_position underflowing).

Fixes #4253.

2020-11-30 11:36:24 +01:00

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