Use Python's raw string in regex pattern. #49
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Otherwise, there will be warnings like:
```
/home/v/litex/litescope/litescope/software/dump/sigrok.py:112: SyntaxWarning: invalid escape se
quence '\w'
m = re.search("probe([0-9]+) = (\w+)", l, re.I)
/home/v/litex/litescope/litescope/software/dump/vcd.py:33: SyntaxWarning: invalid escape sequen
ce '\d'
match = re.fullmatch("(\d+)(\w{0,1})s", timescale)
```
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Otherwise, there will be warnings like:
Similar issue: enjoy-digital/litex#2186