Lua - extract a string using patterns

Question

I'm just starting on Lua Patterns.

I have a string |2|34|56|1

How do I extract the numbers from the string?

I can parse the string manually and exclude all the '|' characters. But I'm sure using Lua patterns will be much simpler.

How do patterns help in this case?

hjpotter92 · Accepted Answer · 2012-07-07 14:21:58Z

4

If you only want to print those numbers, the best method is:

str = "|2|34|56|1"
str:gsub("%d+", print)

Else, if you want the numbers to be stored in a table, a longer approach is required:

str = "|2|34|56|1"
local tFinal = {}
str:gsub( "%d+", function(i) table.insert(tFinal, i) end)
table.foreach(tFinal, print)        -- This is only to verify that your numbers have been stored as a table.

answered Jul 7, 2012 at 14:21

hjpotter92

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3 Comments

SatheeshJM Over a year ago

Thanks! if some strings were present what would be the solution then? Like "|2|34|a|1|ba"

SatheeshJM Over a year ago

NO. I mean if the string was |2|34|a|1|ba, I'd like to extract the strings as well. I need to extract 2,34,"a",1,"ba" Is that possible?

lhf Over a year ago

@SatheeshJM, use "[^|]+" instead of "%d+".

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