simple preg_replace not working

[scarhand]

I have some information in a database, now unfortunately it is all on 1 line

 

i am trying to add line breaks whenever a small letter is followed by a big letter, since this is properly formatted

 

example:

 

The blue birdSang all nightAnd cried all day

 

I need it to output:

 

The blue bird

Sang all night

And cried all day

 

Heres my code:

 

<?php

$poem = preg_replace("$[a-z]{1}[A-Z]$", "$1$2\n", $poem);

?>

 

Its working, except its removing the 2 characters from the start and end of each outputted line.

 

example of the output:

 

The blue bir

ang all nigh

nd cried all da

[scarhand]

got it

 

<?php

$poem = preg_replace("/([a-z]){1}([A-Z])/", "$1\n$2", $poem);

?>

[.josh]

fyi you don't need that {1}