Regex To Break Up camelCase String PHP

Question

Let's say I have the following line:

getPasswordLastChangedDatetime 

How could I break this in capital letters so that I can get:

 get Password Last Changed Datetime 

Answer 1

If you like ASCII characters the most:

 $parts = preg_split("/(?=[AZ])/", $str); 

Demo

The construct (?= ..) is called lookahead ^[docs] .

This works if the parts only contain a capital symbol at the beginning. It gets more complicated if you have things like getHTMLString . This can be compared to:

 $parts = preg_split("/((?<=[az])(?=[AZ])|(?=[AZ][az]))/", $str); 

Demo

Answer 2

Ask about it too early, found this:

 preg_replace('/(?!^)[[:upper:]]/',' \0',$test); 

Answer 3

For example:

 (?:^|\p{Lu})\P{Lu}* 

Answer 4

No complicated solution needed. It does

 preg_replace('/([AZ])/',"\n".'$1',$string); 

It certainly doesn't care about acronyms

Answer 5

 preg_split('@(?=[AZ])@', 'asAs') 

Answer 6

Use this: [az]+|[AZ][az]* or \p{Ll}+|\p{Lu}\p{Ll}*

Answer 7

  preg_split("/(?<=[az])(?=[AZ])/",$password));