Lua lexer incorrectly handling gsub with non-string-literal arguments

[Phroneris]

Name of the lexer
Lua

Code sample

str = string.gsub(str, a, b)  -- valid and no error
str = str:gsub(a, b)          -- valid but error

Although both lines are valid Lua code, the argument part in the latter line is treated as errors.

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Additional context
(None)

[jneen]

The Lua lexer does some very fancy things to try and highlight inside of "regexes" as the arguments to gsub, which it expects to be a string literal. It looks like it's not working properly for the variable case though. I'll take a look at this next week.

[Phroneris]

Thanks, but TBH, it was when I used single-quote literals that I realized this issue.

str = str:gsub("\"", "\\\"")  -- valid and no error
str = str:gsub('"', '\\"')    -- valid but error

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[jneen]

Yep, that should absolutely be valid.