Regular expression?

[Replika]

i have a code get content of a file and remove empty lines in this:

$content = preg_replace("/([\r\n]){2,}/m", "\\1", $content);

but it doesn't remove empty line at first of file.

And remove whitespace from the start and the end of lines:

$content = preg_replace( "/^[ \t]|[ \t]$/s", '', $content);

-> not work 🙁

Anyone help me?
Apologies for my bad english.

[jazz_snob]

You are replacing your pattern with the first match.

//To remove empty lines try this; this will also will remove leading white space.
$content = preg_replace( "/^\s+/m", "", $content );

//Remove white space at end of line
$content = preg_replace( "/\s+$/m", "", $content );

[Replika]

$content = preg_replace( "/^\/\/.*/m", "", $content);

Why that code also remove the comment in line:
abcd //comment xyz

[jazz_snob]

Replika wrote:

$content = preg_replace( "/^\/\/.*/m", "", $content);

Why that code also remove the comment in line:
abcd //comment xyz

Is there a \n or \r\n between 'abcd' and '//comment'?

[execute]

try trim()?
Because it removes whitespace meaning it removes empty lines too, since its considered white space.
Or try doing this:
ereg_replace("\n{2,}", "", $text);
this will remove any new lines thats more than 2!
and try \r\n too

[Replika]

Is there a \n or \r\n between 'abcd' and '//comment'?

sorry, i'm wrong 😛

edit:
And why this code not remove multiline comment at first line:

$content = preg_replace( "/^\/\*.*\*\//s", "", $content);