TYPO3 Core

Change backslash to slash in file format, where backslash is not visible
in rendered HTML - it is a file path, not a PHP namespace.

See https://docs.typo3.org/typo3cms/extensions/core/Changelog/9.4/Feature-85828-MoveSymfonyExpressionLanguageHandlingIntoEXTcore.html

EXT:my_extConfigurationExpressionLanguage.php

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