CODEWITHSUNDEEP
lua
user1440188
user1440188

Reputation: 39

Swap positions of characters in a string

I am looking for the easiest way to take a string, "ACB1 C123" and swap the positions of the space and the following character to "ACB1C 123".

Upvotes: 0

Views: 235

Answers (2)

lhf
lhf

Reputation: 72312

This code does the swap with captures:

s= "ACB1 C123"
print(s:gsub(" (.)","%1 "))

However, it does it for all occurrences of a space followed by a character.

To limit the swap to the first occurrence, use

print(s:gsub(" (.)","%1 ",1))

Upvotes: 0

Yates
Yates

Reputation: 553

Someone else will probably cook up some cool regex gsub but until then you can use these very simple and ugly string modifications and continue what you're doing:

string = "ACB1 C123"
space = string:find(" ")
part = string:sub(space, space+1):gsub("(.)(.)", "%2%1")
newstring = string:sub(0, space-1) .. part .. string:sub(space+2)
print(newstring)

And if you don't like multiple lines here is an even uglier one liner ;)

string:sub(0, string:find(" ")-1) .. string:sub(string:find(" "), string:find(" ")+1):gsub("(.)(.)","%2%1") .. string:sub(string:find(" ")+2)

Upvotes: 1

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