From the documentation, testing myself, and what not. It seems that string.find and string.match are basically the same, all that’s different is the fourth parameter in string.find.
Unless there is other differences or something?
Oh yeah and that string.match returns the pattern if its found, however string.find returns the start and end indicies of the pattern
The first two differences you mentioned in the post are the only differences. That’s it. In fact internally, both string.find and string.match calls only the function str_find_aux with only the find argument being different.
I’m not sure why was string.match added in Lua 5.1 (from Lua 5.0) but this is a question for the Lua author and unfortunately you will not find them on the Roblox DevForum.
static int str_find_aux(lua_State* L, int find)
{
size_t ls, lp;
const char* s = luaL_checklstring(L, 1, &ls);
const char* p = luaL_checklstring(L, 2, &lp);
int init = posrelat(luaL_optinteger(L, 3, 1), ls);
if (init < 1)
init = 1;
else if (init > (int)ls + 1)
{ // start after string's end?
lua_pushnil(L); // cannot find anything
return 1;
}
// explicit request or no special characters?
if (find && (lua_toboolean(L, 4) || nospecials(p, lp)))
{
// do a plain search
const char* s2 = lmemfind(s + init - 1, ls - init + 1, p, lp);
if (s2)
{
lua_pushinteger(L, (int)(s2 - s + 1));
lua_pushinteger(L, (int)(s2 - s + lp));
return 2;
}
}
else
{
MatchState ms;
const char* s1 = s + init - 1;
int anchor = (*p == '^');
if (anchor)
{
p++;
lp--; // skip anchor character
}
prepstate(&ms, L, s, ls, p, lp);
do
{
const char* res;
reprepstate(&ms);
if ((res = match(&ms, s1, p)) != NULL)
{
if (find)
{
lua_pushinteger(L, (int)(s1 - s + 1)); // start
lua_pushinteger(L, (int)(res - s)); // end
return push_captures(&ms, NULL, 0) + 2;
}
else
return push_captures(&ms, s1, res);
}
} while (s1++ < ms.src_end && !anchor);
}
lua_pushnil(L); // not found
return 1;
}
static int str_find(lua_State* L)
{
return str_find_aux(L, 1);
}
static int str_match(lua_State* L)
{
return str_find_aux(L, 0);
}
1 Like
Alright thank you for your help.
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