When opening a page where this script enforces the format of a comment, the Save button will be deactivated per default.

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Users who do not know how to work with comments, may click the Help button ().

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Entering a valid comment will activate the Save button.

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If the comment does not meet the constraints, then the page cannot be saved.

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If the comment is indicating a new feature, then the checkbox for Notify watchers will be checked.

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Typically there is no need to enforce specific comments for each and every change for a page on a Confluence server. Typically versioned documents are located in a specific space. To activate the script for spaces with versioned documents, the 

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Configure the space category via the Space Tools.

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Once the categories contain a category 'versioned', as specified in the