PHP Regex Check if two strings share two common characters?

Why don't you just use this regex $regex = "/. *$line. *$line.

*/m"?

That's not what that regex means. That regex means that each line has either A or B or a pipe at position 0, C or D or a pipe at position 1, etc; A|B means "either 'A' or '|' or 'B'". The '|' only means 'or' outside of character classes.

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