Brian <python-b...@brisammon.fastmail.fm> added the comment:

txt = ' test'
txt = re.sub(r'^\s*', '^', txt)

substitutes once because the * is greedy.

txt = ' test'
txt = re.sub(r'^\s*?', '^', txt)

substitutes twice, consistent with the \Z behavior.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40027>
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