Use Python's raw string in regex pattern. #2186
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Otherwise, there will warnings like:
```
./litex/soc/cores/cpu/cv32e40p/core.py:68: SyntaxWarning: invalid escape sequence '\$'
res = re.search('\$\{DESIGN_RTL_DIR\}/(.+)', l)
```
|
Thanks @higuoxing. |
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Otherwise, there will warnings like: