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In regex, | is used for alternation. What is the corresponding character in Lua patterns?
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Another workaround is: Instead of:
Write:
Explanation: match alternate letters from each word. voila!
First, note that Lua patterns are not regular expressions; they are their own simpler matching language (with different benefits and drawbacks).
Per the specification I've linked to above, and per this answer, there is no alternation operator in a Lua pattern. To get this functionality you'll need to use a more powerful Lua construct (like LPEG or a Lua Regex Library).