PyREPL does not recognize OSC sequences

[edvilme]

PyREPL’s ANSI_ESCAPE_SEQUENCE regex currently recognizes CSI sequences but not Operating System Command (OSC) sequences. As a result, OSC sequences embedded in sys.ps1, such as VS Code’s OSC 633 terminal integration markers, are treated as visible characters and can cause incorrect prompt width calculation and cursor positioning. PyREPL should recognize OSC sequences as zero-width terminal controls.

This is especially evident when pressing tab to autocomplete

Default sys.ps1 with no OSC sequence

Overwritten sys.ps1 with OSC sequence

Notice the difference in tab length, and after deleting, it is impossible to remove the remaining text (second picture)

Linked PRs

• gh-157928: PyREPL detect OSC sequences #157932

[hosu3das20s05s]

Thanks, I'll follow up.

…

On Mon, Sep 21, 2026 at 9:58 PM Eduardo Villalpando Mello < ***@***.***> wrote: *edvilme* created an issue (python/cpython#157928) <#157928> PyREPL’s ANSI_ESCAPE_SEQUENCE regex currently recognizes CSI sequences but not Operating System Command (OSC) sequences. As a result, OSC sequences embedded in sys.ps1, such as VS Code’s OSC 633 terminal integration markers, are treated as visible characters and can cause incorrect prompt width calculation and cursor positioning. PyREPL should recognize OSC sequences as zero-width terminal controls. This is especially evident when pressing tab to autocomplete Default sys.ps1 with no OSC sequence Image: Image (view on web) <https://github.com/user-attachments/assets/d5712fbb-f619-4527-a7ef-72bb77e60eb6> Overwritten sys.ps1 with OSC sequence Notice the difference in tab length, and after deleting, it is impossible to remove the remaining text (second picture) Image: Image (view on web) <https://github.com/user-attachments/assets/acb9755b-5fbe-4df4-8f70-f2d7875377de> Image: Image (view on web) <https://github.com/user-attachments/assets/7c055989-56f5-4f65-bccd-5308babc4b23> — Reply to this email directly, view it on GitHub <#157928?email_source=notifications&email_token=CJH4FSWNT24UG6TNIUGAP2D5QGI6BA5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJVGMZDGOBTGM4DBJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/CJH4FSVBVCBCN6LJ7J5PH735QGI6BAVCNFSNUABEKJSXA33TNF2G64TZHM4DCNJZHA4TMMJ3JFZXG5LFHM2TKMZSGM4DGMZYGCQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/CJH4FSXQWR5FV6ZGYSUJVML5QGI6BA5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJVGMZDGOBTGM4DBJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/CJH4FSQZTCYBBYLIV3X5ZG35QGI6BA5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJVGMZDGOBTGM4DBJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>