Heyyo!
I need some help figuring out how to detect if a certain string is a colour value…
For instance
local Colour_1 = "255, 85, 85"
local Colour_2 = "10, ab"
How would I make it print its respective thing?
Colour_1 → “Yes”
Colour_2 → “No”
Check if one has any letters inside it: (you need to remove komma’s and spaces first)
function CheckStringIfRgb(input)
local str = string.gsub(input, ",", "")
local str = string.gsub(str , " ", "")
if tonumber(str) ~= nil then
return true
else
return false
end
end
I’m not a string manipulation expert, but this allows you to ignore invalid colors (any component below 0 or over 255 [or 1]):
local Integer = "255, 230, 200"
local Float = "0.2, 0.5, 0.8"
local Integer_Erroneous = "256, 255, 254"
local Float_Erroneous = "1.1, 1.4, 1"
local function Is_Color_Compatible(S : string, Use_RGB : boolean?)
local Splits = S:split(",")
local R, G, B = tonumber(Splits[1]), tonumber(Splits[2]), tonumber(Splits[3])
assert(typeof(R) == "number", "R is not a number.")
assert(typeof(G) == "number", "G is not a number.")
assert(typeof(B) == "number", "B is not a number.")
local Out_Of_Bounds = {}
local Invalid = false
for K, C_Comp in pairs({R = R, G = G, B = B}) do
if Use_RGB then
if not (C_Comp <= 255 and C_Comp >= 0) then
Out_Of_Bounds[K] = C_Comp
Invalid = true
end
else
if not (C_Comp <= 1 and C_Comp >= 0) then
Out_Of_Bounds[K] = C_Comp
Invalid = true
end
end
end
if Invalid then
warn("The following color components are invalid:", Out_Of_Bounds)
return false
end
return true
end
-- RGB int
print(Is_Color_Compatible(Integer, true))
print(Is_Color_Compatible(Integer_Erroneous, true))
-- RGB float
print(Is_Color_Compatible(Float))
print(Is_Color_Compatible(Float_Erroneous))
Updated with decimal numbers (e.g Color3.new(1, 0.5, 0.2))
Most optimal way is this:
print(string.match("255, 255, 255", "^[0-255]+, [0-255]+, [0-255]+")) -- True (returns the match if true else nil)
This ensures that the values are present and they are in the range of 0-255.
1 Like
How would I use this to determine a value such as “30, 10, 2”?
You can just do
print(string.match("YOUR_VALUE", "^[0-255]+, [0-255]+, [0-255]+")) -- True (returns the match if true else nil)
And just check whether the return value isn’t nil, (if its nil, it means it doesnt match).
I guess I should say I am not understanding how it functions nor how to use it properly… When I put my value it just returns nil and it meets the requirements of 0 - 255
Could you show me your current code?
Apologize for my previous post, I mistook the title of the post.
If the strings you are feeding into the function are formatted like that, you can use:
function isRGBValue(colorstring)
colorstring = string.gsub(colorstring," ","");
local colortable = string.split(colortable,",");
if #colortable ~= 3 then
return false
else
for _,v in ipairs(colortable) do
if tonumber(v) ~= nil or tonumber(v) < 0 or tonumber(v) > 255 then
return false
end
end
end
return true
end
1 Like
I’ll test this right now! TY… |Extra Characters|
Thank you man! Works wonderfully!
local function stringToColor3(s : string) : (string) -> (Color3)
local t : {} = string.split(s, ", ")
for i, v in ipairs(t) do
t[i] = math.clamp(v, 0, 255)
end
return Color3.new(table.unpack(t))
end
local c : Color3 = stringToColor3("255, 85, 85")
print(c.R, c.G, c.B) --255, 85, 85
local c : Color3 = stringToColor3("500, 500, 500")
print(c.R, c.G, c.B) --255, 255, 255
The original poster-sama asked to detect if the RGB color string is valid, not a conversion function that fixes range using clamping.
if #t ~= 3 then return end --Before the loop.
if not tonumber(v) then return end --Inside of the loop.
Then add these two lines. It may as well return a ‘Color3’ value since one is likely going to be constructed anyway.
Added a few comments to highlight some issues.
function isRGBValue(colorstring) --Should be defined locally.
colorstring = string.gsub(colorstring," ",""); --Will error if 'colorstring' is not a string.
local colortable = string.split(colortable,","); --Would also error if 'colorstring' is not a string.
if #colortable ~= 3 then
return false
else
for _,v in ipairs(colortable) do
if tonumber(v) < 0 or tonumber(v) > 255 then --Will error if 'tonumber' returns 'nil' (attempt to compare nil and number).
return false
end
end
end
return true
end
the second and third will probably never apply since, quoting a tf2 developer, No one will ever try to pass in bad data? Right?, but in all seriousness, they will probably be using this with the text of a textbox or from .Chatted, which in themselfves, give strings!
they will probably be using this with the text of a textbox or from .Chatted
‘probably’ being the operative word (speculative). What about the third issue? It should be noted that calling tonumber on the same value twice is redundant.
function isRGBValue(colorstring) --Should be defined locally.
colorstring = string.gsub(colorstring," ","");
local colortable = string.split(colorstring,",");
if #colortable ~= 3 then
return false
else
for _,v in pairs(colortable) do
if tonumber(v) == nil or tonumber(v) < 0 or tonumber(v) > 255 then
return false
end
end
end
return true
end
This is with all bugs fixed lol
I’m sorry for partially necro bumping 
Hey, what is the RGB range for Roblox?
0-255 or 0-100?