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gh-69365: Show search pattern errors in the IDLE search dialogs - #157598

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serhiy-storchaka:gh-69365-search-error-inline
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serhiy-storchaka:gh-69365-search-error-inline

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@serhiy-storchaka serhiy-storchaka commented Sep 15, 2026

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The Find, Replace and Find in Files dialogs now show a regular expression error in red below the entry, as the Open Module dialog does, and move the cursor to the offending character, instead of a message box that has to be dismissed first. The message is cleared when the pattern is edited. Find Again without a dialog still uses the message box.

The pattern is now checked as typed, so that the position is right. This also fixes the "Whole word" option with a regular expression: the pattern is grouped, so that a|b is anchored on both sides, and a pattern ending with a backslash is an error instead of matching \b. Global flags like (?i) cannot be used with "Whole word"; the error message now says so.

🤖 Generated with Claude Code

Show the error in red below the entry and move the cursor to the
offending character in the pattern, instead of a message box. Find
Again without a dialog still uses the message box.

Check the pattern as typed, so that the position is right. This also
fixes the "Whole word" option with a regular expression: the pattern
is now grouped, so that "a|b" is anchored on both sides, and a pattern
ending with a backslash is an error instead of matching "\b".

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
@terryjreedy

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Unrelated failure: (rerunning)
Ubuntu (bolt) / build and test (ubuntu-26.04)
Warning -- test_multiprocessing_main_handling leaked temporary files (1): tmpdd3au45m

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