Re: Is there a patch for "str" in "str" expressions?

[Lorenzo Donati <lorenzodonatibz@...>]

On 15/06/2022 06:15, Flyer31 Test wrote:
> If you mean a function like strstr(str, find), which would return you
> the position of the substring find in string str, this does NOT exist
> in SIMPLE form in Lua string library ... you have to use string.find
> or similar for this with such "match pattern".
>
> I must admit that I also do NOT like this very much ... when I made my
> own "static string lib" for minumum RAM requirement Lua (< 40-60kB Lua
> stack), I also added such a "simple find function" similar to strstr.
>
> On Tue, Jun 14, 2022 at 1:46 AM Ryan Starrett <pyryanggg@gmail.com> wrote:
> > Subject, basically. It's similar to the behavior found in Python, I'm just curious if there's an existing patch for it. Otherwise, are there resources that can help me make one?

I don't know Python, but isn't the fourth argument of string.find just 
for that? That is:

string.find(str, substring, 1, true ) --> i_start, i_end

Where i_start and i_end are the indexes of the start and end of 
substring inside str (without using pattern matching).


Lua Manual (5.3) excerpt:

----------------------------------------------------------------------
Looks for the first match of pattern (see §6.4.1) in the string s. If it 
finds a match, then find returns the indices of s where this occurrence 
starts and ends; otherwise, it returns nil. A third, optional numeric 
argument init specifies where to start the search; its default value is 
1 and can be negative. A value of true as a fourth, optional argument 
plain turns off the pattern matching facilities, so the function does a 
plain "find substring" operation, with no characters in pattern being 
considered magic. Note that if plain is given, then init must be given 
as well.
----------------------------------------------------------------------

-- Lorenzo