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<?php var_export( preg_match( '/(?<0>[a-z]+) (?<1>\d+)/in', 'Foo 411', $m ) ? $m : [] );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: subpattern name must start with a non-digit at offset 3 in /in/97lST on line 4 array ( )

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