Fix FutureWarning for words() with "[" #1854
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regex_opt() groups characters in sets when possible. The warning was caused when the "[" character ended up at the beginning of a set: r"[[...]". This emits a FutureWarning since Python 3.7 due to possible changes in semantics in the future (https://bugs.python.org/issue30349). Just add "[" to the list of characters that should be escaped in sets. Add unit tests for words(). [Closes pygments#1853.]
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regex_opt() groups characters in sets when possible. The
warning was caused when the "[" character ended up at the beginning
of a set: r"[[...]". This emits a FutureWarning since Python 3.7
due to possible changes in semantics in the future
(https://bugs.python.org/issue30349). Just add "[" to the list
of characters that should be escaped in sets. Add unit tests
for words().
[Closes #1853.]