HTML and JavaScript files are sometimes being misdetected as Perl files, due to the following match rule for application/x-perl: <match type="string" value="use strict" offset="0:256"/> This is too broad. It incorrectly matches against ECMAScript's strict-mode syntax[1], which can look like one of the following lines (including quotes and semicolon): "use strict"; 'use strict'; This seems to have been introduced in commit a6bdb6a198f8f9fe4153f72e5b4d10e1b5057c3e (shared-mime-info 1.2), which was related to bug 63612. As a solution, I suggest to replace the above match rule with rules that will match the Perl syntax without matching the quote-surrounded JavaScript syntax: <match type="string" value="use strict;" offset="0:256"/> <match type="string" value="use strict " offset="0:256"/> A patch will be attached to this bug. [1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
Created attachment 138469 [details] [review] patch: Perl detection: Don't match ECMAScript "use strict" syntax
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