'How do I match a string with "-" in it with LUA?

I am trying to match text in between two strings. So far, this works well on 'find1', but 'find2' produces an error.

Example1:

find1 = cmd:match("<model>(.*)</model>") or "ERROR"
find2 = cmd:match("<sw-version>(.*)</sw-version>") or "ERROR"
print(find1, find2)

Result:

model
ERROR

Example2:

find1 = cmd:match("<model>(.*)</model>") or "ERROR"
find2 = cmd:match("<sw\-version>(.*)</sw\-version>") or "ERROR"
print(find1, find2)

Result:

model
ERROR

I am using and can only use native LUA. I believe my code is fine for the purpose I need. I am just wondering if "-" is an operator and/or if "-" is interpreting it as a range? If so, how do I fix it? I've tried it with the "\" escape character and it has not fixed it.

lua


Solution 1:[1]

You can use % symbol to escape special characters, (including % itself), so using cmd:match("<sw%-version>(.*)</sw%-version>") or "ERROR" should work. See the manual for further details.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Paul Kulchenko

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