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<?php $tests = [ '/[$-\w]/', '/[\w-$]/', '/[\w-]/', '/[-\w]/', '/[$-]/', '/[-$]/', ]; foreach($tests as $test) { echo "$test\n"; preg_match($test,''); }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
/[$-\w]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 5 in /in/fk0Ij on line 14 /[\w-$]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 3 in /in/fk0Ij on line 14 /[\w-]/ /[-\w]/ /[$-]/ /[-$]/
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 /[$-\w]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 5 in /in/fk0Ij on line 14 /[\w-$]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 3 in /in/fk0Ij on line 14 /[\w-]/ /[-\w]/ /[$-]/ /[-$]/
Output for 7.3.16 - 7.3.33
/[$-\w]/ /[\w-$]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 3 in /in/fk0Ij on line 14 /[\w-]/ /[-\w]/ /[$-]/ /[-$]/
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
/[$-\w]/ Warning: preg_match(): Compilation failed: invalid range in character class at offset 4 in /in/fk0Ij on line 14 /[\w-$]/ /[\w-]/ /[-\w]/ /[$-]/ /[-$]/
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147.81 ms | 402 KiB | 160 Q