Support for preprocessor macro variables, e.g. __LINE__

[LonelyCat124]

Is this something that would be easy for us to add support into fparser for? @arporter @sergisiso

[MingqiangZhao]

you can change these lines in pattern_tools.py

letter = Pattern("<letter>", "[A-Z]", flags=re.I)
if dollar_ok:
    name = Pattern("<name>", r"[A-Z][\w$]*", flags=re.I)
else:
    name = Pattern("<name>", r"[A-Z]\w*", flags=re.I)

to

letter = Pattern("<letter>", "[A-Z]", flags=re.I)
if dollar_ok:
    name = Pattern("<name>", r"[A-Z_][\w$]*", flags=re.I)
else:
    name = Pattern("<name>", r"[A-Z_]\w*", flags=re.I)