[ 0 => '$40 for a g3/400', 1 => '/',]
[ 'result' => [ 'string' => '\\$40 for a g3\\/400', ], 'php_version' => '7.1.33 Linux x86_64',]
'*very*'
[ 'result' => [ 'string' => '\\*very\\*', ], 'php_version' => '7.1.33 Linux x86_64',]