SyntaxWarnings emmitted when running nbdev_export && nbdev_clean && nbdev_trust

[corneliusroemer]

Mminimally reproducible example

In the root of the repo run:

conda create -n nbdev1433 -c conda-forge nbdev jupyterlab
conda activate nbdev1433
nbdev_export && nbdev_clean && nbdev_trust

Expected output: None

Actual output:

❯ nbdev_export && nbdev_clean && nbdev_trust
<unknown>:28: SyntaxWarning: invalid escape sequence '\F'
<unknown>:28: SyntaxWarning: invalid escape sequence '\F'
<unknown>:28: SyntaxWarning: invalid escape sequence '\F'
<unknown>:28: SyntaxWarning: invalid escape sequence '\F'
<unknown>:5: SyntaxWarning: invalid escape sequence '\|'
<unknown>:5: SyntaxWarning: invalid escape sequence '\|'
<unknown>:5: SyntaxWarning: invalid escape sequence '\|'
<unknown>:5: SyntaxWarning: invalid escape sequence '\|'
<unknown>:9: SyntaxWarning: invalid escape sequence '\.'
<unknown>:7: SyntaxWarning: invalid escape sequence '\$'
<unknown>:9: SyntaxWarning: invalid escape sequence '\.'
<unknown>:7: SyntaxWarning: invalid escape sequence '\$'
<unknown>:9: SyntaxWarning: invalid escape sequence '\.'
<unknown>:7: SyntaxWarning: invalid escape sequence '\$'
<unknown>:9: SyntaxWarning: invalid escape sequence '\.'
<unknown>:7: SyntaxWarning: invalid escape sequence '\$'
<unknown>:7: SyntaxWarning: invalid escape sequence '\s'
<unknown>:7: SyntaxWarning: invalid escape sequence '\S'
<unknown>:7: SyntaxWarning: invalid escape sequence '\s'
<unknown>:7: SyntaxWarning: invalid escape sequence '\S'
<unknown>:7: SyntaxWarning: invalid escape sequence '\s'
<unknown>:7: SyntaxWarning: invalid escape sequence '\S'
<unknown>:7: SyntaxWarning: invalid escape sequence '\s'
<unknown>:7: SyntaxWarning: invalid escape sequence '\S'
<unknown>:28: SyntaxWarning: invalid escape sequence '\F'
<unknown>:9: SyntaxWarning: invalid escape sequence '\.'
<unknown>:7: SyntaxWarning: invalid escape sequence '\$'
<unknown>:5: SyntaxWarning: invalid escape sequence '\|'
<unknown>:7: SyntaxWarning: invalid escape sequence '\s'
<unknown>:7: SyntaxWarning: invalid escape sequence '\S'