Php – Delimiter must not be alphanumeric or backslash [duplicate]

make sure to do proper escapes on anything that needs escaping. So escape

OS/2 to OS\/2 
7.0 to 7\.0 

. / ? * etc etc are all special to preg, so you should not use them in your pattern unless you escape them or when you want to use their “special powers”

UPDATE: Had to put it in codeblock to see the escapes 😉

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