add class to each line of css with regex - regex

Question

I want to add a class at the start of each line of my css
I want
.more {
padding: 5px 10px 0;
}
#fbook {
display: inline;
float: left;
margin: 0 0 0 4px;
width: 320px;
}
to look like
.test .more {
padding: 5px 10px 0;
}
.test #fbook {
display: inline;
float: left;
margin: 0 0 0 4px;
width: 320px;
}
something like this.
^([A-Za-z0-9]+)$
would work if my css looked like this
more
{
padding: 5px 10px 0;
}
fbook
{
display: inline;
float: left;
margin: 0 0 0 4px;
width: 320px;
}
but I can't seem to get anything working when to find the . # {

Answer 1

Try this
$result = preg_replace('/(?i)^([.#a-z]+\{)$/m', '.test $1', $subject);
Explanation
"
(?im) # Match the remainder of the regex with the options: case insensitive (i); ^ and \$ match at line breaks (m)
^ # Assert position at the beginning of a line (at beginning of the string or after a line break character)
( # Match the regular expression below and capture its match into backreference number 1
[.#a-z] # Match a single character present in the list below
# One of the characters “.#”
# A character in the range between “a” and “z”
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\{ # Match the character “{” literally
)
\$ # Assert position at the end of a line (at the end of the string or before a line break character)
"

Answer 2

You can use a modern tool like LESS. Simply take your code, and wrap it with .test{ }:
.test {
.more {
padding: 5px 10px 0;
}
#fbook {
display: inline;
float: left;
margin: 0 0 0 4px;
width: 320px;
}
}
If you only need it one time, you can do it online: http://leafo.net/lessphp/#demo
If you want to do it from time to time, there are less libraries for many languages which you can use, and a client side JavaScript option.