How can Lua determine if a string contains a specific character?

2 years ago
Olivia Parker
1 minute

In Lua, you can use the function string.find to determine if a string contains a specified character. The function string.find returns two values: the starting position of the matched string and the ending position. If it does not find a match, it returns nil.

Here is a sample code to determine if a string contains the character ‘a’:

local str = "hello world"
local result = string.find(str, "a")

if result ~= nil then
    print("字符串包含字符a")
else
    print("字符串不包含字符a")
end

When running the above code, the output result is:

字符串不包含字符a

To determine if a string contains multiple characters, you can use regular expressions for matching. In Lua, you can use the string.match function for regular expression matching. Below is an example code using regular expressions to check if a string contains the characters ‘a’ or ‘b’:

local str = "hello world"
local result = string.match(str, "[ab]")

if result ~= nil then
    print("字符串包含字符a或b")
else
    print("字符串不包含字符a或b")
end

Running the above code will produce the following output:

字符串不包含字符a或b
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