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<?php $tests = [ '/[$-\w]/', '/[\w-$]/', '/[\w-]/', '/[-\w]/', '/[$-]/', '/[-$]/', ]; foreach($tests as $test) { echo "$test\n"; preg_match($test,''); }
Output for git.master, git.master_jit, rfc.property-hooks
/[$-\w]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 5 in /in/fk0Ij on line 14 /[\w-$]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 3 in /in/fk0Ij on line 14 /[\w-]/ /[-\w]/ /[$-]/ /[-$]/

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