Authors CurseForge

Hi,

This seems to be the hardest for me to understand so I'm guessing this is one of the most talked about topics. What I'm trying to do is find the last occurrence of ", " in a string. This is my last try:

local ows = "Marie (Patsy), Peter (Trapdoor), Tom (Blackmagé)"
print (ows:sub(ows:find(", [%w%s()]-$")))

and it doesn't work. if I change the "é" to a "e" it's fine. So I'm thinking I'm going about it all the wrong way. Would anyone have any suggestions how I can look for the last ", "?

Hal

why not try to search for everything exept the ,

like this

local ows = "Marie (Patsy), Peter (Trapdoor), Tom (Blackmagé)"
print (ows:sub(ows:find(", [^,]-$")))

the [^,] is the complement set to [,] so it will find everything that [,] would not match to

If all you want is the stuff after the last comma in a comma separated list:

local function helper(...)
    local last = ""
    for i = 1, select("#", ...) do
        last = select(i, ...)
    end
    return strtrim(last)
end
local ows = "Marie (Patsy), Peter (Trapdoor), Tom (Blackmagé)"
local last = helper(strsplit(",", ows))
print(last)

Wow! Thank you to everyone for your quick and helpful replies. I've been able to solve my problem. :)

Quote from Farmbuyer

Special tokens like %w don't "work" in WoW. You'd have to use a more literal expression like "[A-Za-z]" to go this route.

Things like %w depend on the locale/language in use, which for WoW is hardcoded to be American English, more or less.

I'm not sure, but I seem to have problems with accented characters in other areas. Trying to make just the first letter a capital with the rest lower case has causes me grief when the first letter is accented. Would you think this is related?

Quote from OrionShock

local function helper(...)
    local i = select("#", ...)
    return select(i, ...)
end
local ows = "Marie (Patsy), Peter (Trapdoor), Tom (Blackmagé)"
local last = helper(strsplit(",", ows))
print(last)

no need to itterate all the variables just to get the last one.

/facepalm

Why didn't I think of that?!?

You spelled "iterate" wrong, by the way. :p

Quote from Adirelle

LUA

/twitch

Small reminder, Blizzard has patched string.upper and string.lower to be UTF-8 aware. But nothing that uses string pattern matching is UTF-8 aware, just string.upper and string.lower.

4 bytes is max for a character in UTF-8, not sure what actually uses 4 bytes though. The 26 letter English alphabet uses 1 byte, all the additional accented characters used by other languages use 2 bytes, Cyrillic uses 2 bytes, CJK (Chinese Japanese Korean) use 3 bytes.

Unicode characters U+0 to U+7F (127) are encoded in 1 byte.
Unicode characters U+80 to U+7FF (2047) are encoded in 2 bytes.
Unicode characters U+800 to U+FFFF (65535) are encoded in 3 bytes.
Unicode characters U+10000 to U+10FFFF are encoded in 4 bytes.

The encoding accepts more (up to 0x1FFFFF) in 4 bytes, but Unicode has no characters above U+10FFFF. All characters in the BMP (Basic Multilingual Plane) are encoded in at most 3 bytes.

Per the Unicode standard, the Basic Multilingual Plane (BMP, or Plane 0) contains the common-use characters for all the modern scripts of the world as well as many historical and rare characters. By far the majority of all Unicode characters for almost all textual data can be found in the BMP.

Plane 1, or the SMP (Supplementary Multilingual Plane) is dedicated to the encoding of lesser-used historic scripts, special-purpose invented scripts, and special notational systems, which either could not be fit into the BMP or would see very infrequent usage.

Example of characters in Plane 1 includes Music symbols, a lot of archaic languages, lots of supplementary mathematical symbols, Mahjong and Domino tiles too.

For instance, U+1D11E is MUSICAL SYMBOL G CLEF, or ????, and is encoded in UTF-8 like this : "\240\157\132\158".

Edit: I give up. The forum can't handle this unicode character :-)

Recent revisions of the Unicode specification make characters higher than U+10FFFF invalid in UTF-8 meaning the max bytes for a single character is 4.

The following pattern is giving me a headache lately: I would like to match single quotes preceded by whitespace or none (start of string) followed by a string of any characters and finishing with again a single quote followed by whitespace or none. So basically I am trying to capture the longest possible chain between quotes even if they are at the start or at the end of a string while skipping [['s ]]. Something like:

local str = [[1st Kvaldir Vessel 'The Serpent's Maw']]
str = str:match("[ ^.]'.+'[ ^.]")
print(str)	--->	'The Serpent's Maw'

Yet sets like [ ^.] don't work, anchoring with ^ and $ is no good obviously and frontier patterns did not help much either. Any suggestions are greatly appreciated!