What is the alternation operator in Lua patterns?

问题:

In regex, | is used for alternation. What is the corresponding character in Lua patterns?

回答1:

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).

回答2:

Another workaround is: Instead of:

apple|orange

Write:

[ao][pr][pa][ln][eg]

Explanation: match alternate letters from each word. voila!