How to use Regex to replace string?

Question

I have a string and I want to change it using regex:

import re 
s1 = "FirstName0001LastName0001"
s2 = re.sub('LastName', 'FamilyName', s1)
s2 = re.sub('FirstName', 'Contact', s1)

Expected Result s2 = "Contact0001FamilyName0001", Is there any other way to do this in one line of code?

What's the point of the `s2 = re.sub('LastName', 'FamilyName', s1)` line? It doesn't seem relevant here (unless your expected result is wrong). Also, you probably don't need regex for this. `s2 = s1.replace("FirstName", "Contact")` is sufficient. — 41686d6564 stands w. Palestine, Nov 09 '20 at 16:06
You do not use the first substitution result when you run `s2 = re.sub('FirstName', 'Contact', s1)`, why? — Wiktor Stribiżew, Nov 09 '20 at 16:12
Does this answer your question? https://stackoverflow.com/questions/6116978/how-to-replace-multiple-substrings-of-a-string — buddemat, Nov 09 '20 at 16:13

score 1 · Accepted Answer · answered Nov 09 '20 at 16:09

I may get downvoted for doing this, but:

s1 = "FirstName0001LastName0001"
s2 = s1.replace('LastName', 'FamilyName').replace('FirstName', 'Contact')
print(s2)  # prints Contact0001FamilyName0001

You may not even need to use a re.sub regex replacement here, and you can just chain the replacement calls in a single line.

How to use Regex to replace string?

1 Answers1