Re: string.find() question

["Soni L." <fakedme@...>]

On 2017-09-05 04:43 PM, Lev wrote:
> Hi all,
>
>
> I have some issues with string.find().
>
> What do I miss?
>
>
> $ lua5.3
> Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> > str='--d8eb6ad5-707f-4518-8de9-0a339383199b--'
> > return string.find(str, '--d8eb6ad5-707f')
> nil
> > return string.find(str, '--d8eb6ad5-')
> 1	9
> > return string.find(str, '--d8eb6ad5-7')
> nil
> I've tried that with 5.1, 5.2 and 5.3. All on Debian Stable, and also with 5.1 on some embedded platform on LEDE 17.01.1. Same result.
>
>
> Any help welcome.

> return string.find(str, '--d8eb6ad5')
1    10

That's because - has a special meaning in Lua patterns:

http://www.lua.org/manual/5.3/manual.html#6.4.1

A pattern item can be

[...]
- a single character class followed by '-', which also matches zero or 
more repetitions of characters in the class. Unlike '*', these 
repetition items will always match the shortest possible sequence;

> Thanks,
> Levente

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