CODEWITHSUNDEEP
error-handlinglua
user3806186
user3806186

Reputation: 63

Parsing an error string in Lua

Lets say I have the following error string:

err = "/mnt/cd4/autorun.lua:43: 'end' expected (to close 'while' at line 1) near '-eof-'"

How would I parse the file path, line number, and the error message separately from the string?

I have no prior experience in parsing Lua strings, so I thought asking here would be useful. I also tried finding a topic solving the same matter but I could not find one.

Upvotes: 4

Views: 644

Answers (1)

Paul Kulchenko
Paul Kulchenko

Reputation: 26744

Something like this should work:

err = "/mnt/cd4/autorun.lua:43: 'end' expected (to close 'while' at line 1) near '-eof-'"
local file, line, errmsg = err:match('^(.-):(%d+):(.+)')
print(file, line, errmsg)

The pattern says: capture starting at the end of the line (^) a shortest group of zero or more (-) of any symbol (.), followed by :, then a group of one or more digits (%d+), followed by :, and then a group of one of more symbols (.+). You can read about patterns here.

Upvotes: 2

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