Regular Expressions 101

Explanation
Pro

Negative Lookbehind(?<!os\.)

osthe literal text os (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ba Unicode word boundary

paththe literal text path (case sensitive)

\ba Unicode word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<!os\.)\bpath\b

if path and not os.path.sep in path
chaos.path won't match
but as.path will, as it checks for literal os.
pathhello and worldpath won't match due to word boundaries
O'path will.