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Fix Deprecation warnings from regex module

Chandan Singhrequested to merge
chandan/fix-warning into master

Description

Currently we are getting the following deprecation warnings from the standard regex library:

tests/frontend/logging.py:44
  /builds/BuildStream/buildstream/dist/buildstream/tests/frontend/logging.py:44: DeprecationWarning: invalid escape sequence \[
    m = re.search("\[\d\d:\d\d:\d\d\]\[\]\[\] SUCCESS Checking sources", result.stderr)

tests/frontend/logging.py:80
  /builds/BuildStream/buildstream/dist/buildstream/tests/frontend/logging.py:80: DeprecationWarning: invalid escape sequence \d
    m = re.search("\d\d:\d\d:\d\d,\d\d:\d\d:\d\d.\d{6},\d\d:\d\d:\d\d,,,SUCCESS,Checking sources", result.stderr)

tests/examples/junctions.py::test_open_cross_junction_workspace
  /builds/BuildStream/buildstream/dist/buildstream/buildstream/utils.py:213: DeprecationWarning: Flags not at the start of the expression '\\/[^/]*\\Z(?ms)'
    regexer = re.compile(expression)

Changes proposed in this merge request:

  • tests/frontend/logging.py: Fix regex Deprecation Warning
  • buildstream/utils.py: Fix regex Deprecation Warning

This merge request, when approved, will close:

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