Add underscore in front of capital letters, but only first capital letter if there are multiple in a row

Question

Trying to convert something like WebsiteURL to website_url. I was able to convert it to website_u_r_l using this suggestion: PHP - add underscores before capital letters

However, that doesn't work for my requirements. Having a hard time finding a better answer. Maybe the simpler solution is to convert multiple capitals in a row first, so WebsiteUrl? Wondering what the most efficient route would be.

Check https://stackoverflow.com/questions/1993721/how-to-convert-camelcase-to-camel-case — Wiktor Stribiżew, Aug 14 '18 at 14:05

score 1 · Answer 1 · answered Aug 14 '18 at 14:08

1

 echo strtolower(preg_replace('%([a-z])([A-Z])%', '\1_\2', "WebsiteURL"));

check solution here

answered Aug 14 '18 at 14:08

Azouz Mohamadi

141
1
2

score 0 · Answer 2 · answered Aug 14 '18 at 14:07

0

This code below achieves what I think you want to achieve

$result = strtolower(preg_replace('/(.)([A-Z])/', '$1_$2', $subject));

Converting

TestTest
testTest
testingTest

To:

testing_test
test_test
test_test

Found at this src

answered Aug 14 '18 at 14:07

Isaac

784
10
23

This was close, but converted `WebsiteURL` to `website_ur_l` – roubix Aug 14 '18 at 14:43
My mistake, I thought you had `WebsiteUrl` not `WebSiteURL` ! apologies! – Isaac Aug 14 '18 at 14:47

Add underscore in front of capital letters, but only first capital letter if there are multiple in a row

2 Answers2