Convert 3 consecutive number in a string with a symbol

Question

I was trying to change every 3 consecutive numbers in string with "@" symbol.
I don’t mean 1.2.3 , but every 3 numbers .

input ="kJF534kdfkj23kk222"

Desired output :

output="kJF@@@kdfkj23kk@@@"

I’m a beginner in Python and I didn’t know how to do that.

I tried the following but I’m having trouble in my for loop.

if i.isdigit() and (i+1).isdigit() and (i+2).isdigit():
    output = input.replace(i, "@")
    output=input.replace(i+1,"@")
    output=input.replace(i+2,"@")

Asked By: BouhaaCode

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Source

Answer 1

I would use regular expressions:

import re

s = "kJF534kdfkj23kk222"
out = re.sub(r"d{3}","@@@", s)
print(out)

output:

"kJF@@@kdfkj23kk@@@"

This will match every sequence of 3 consecutive digits (d match a digit, {3} indicates a sequence of 3) and replace them with @@@

Answered By: PlainRavioli

Answer 2

You can use the re (regex for python) standard package, to match all groups of 3 numbers and replace them through re.sub by the desired string.

import re

input = "kJF534kdfkj23kk222"
# [0-9] is a regex to match all digits, the {3} part tells the regex
# to search for exactly three digits occurrences
output = re.sub("[0-9]{3}", "@@@", input)

Answered By: Pierre-Nicolas Piquin

Convert 3 consecutive number in a string with a symbol

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