Re: how to strip empty lines out of a txt using preg_replace()

On Fri, 2009-09-04 at 16:13 +0200, Ralph Deffke wrote: > and this is the PHP_EOL solution: > $dtd = preg_replace( "/[". PHP_EOL . "]+/", "". PHP_EOL . > "", $dtd); > > dont ask me why two empty strings are needed to surround the PHP_EOL but its > does it. > > Why this works? we have got an INTERPRETER here any \n is transtlated into > 0x0D an \r into 0x0A so the pattern does not reach prce as '\n' hehe > > > "Martin Scotta" <martinscotta@gmail.com> wrote in message > > news:6445d94e0909040653i44716f79m972f1105559901a@mail.gmail.com... > > On Fri, Sep 4, 2009 at 10:37 AM, Ralph Deffke <ralph_deffke@yahoo.de> > wrote: > > > > > the problem is some have got \t\n > > > some are just \n\n....\n > > > > > > using PHP_EOL is a must > > > > > > I thing must be something with the /../sm attributes to the regex, spend > > > like half an hour, but didn't get it, I'm running against a dead line, > > > doesn't seem to be that easy if regex is not the everydays need u have > > > > > > > > > "Ashley Sheridan" <ash@ashleysheridan.co.uk> wrote in message > > > news:1252071327.24700.152.camel@localhost... > > > > On Fri, 2009-09-04 at 15:28 +0200, Ralph Deffke wrote: > > > > > ok > > > > > preg_replace( "/^\s*$/m", "", $somestring) > > > > > does not take empty lines out > > > > > > > > > > "Ashley Sheridan" <ash@ashleysheridan.co.uk> wrote in > > > > > message > > > > > > > > > > news:1252069539.24700.150.camel@localhost... > > > > > > On Fri, 2009-09-04 at 14:58 +0200, Ralph Deffke wrote: > > > > > > > Hi all, I'm a bit under stress, maybe somebody knows the > > > > > > > regex > on a > > > > > snap. > > > > > > > using PHP_EOL would be great. > > > > > > > > > > > > > > thanks > > > > > > > ralph_deffke@yahoo.de > > > > > > > > > > > > > > > > > > > > > > > > > > > The regex that would match a line containing only whitespace would > > > look > > > > > > like this: > > > > > > > > > > > > ^\s*$ > > > > > > > > > > > > Thanks, > > > > > > Ash > > > > > > http://www.ashleysheridan.co.uk > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Are the lines actually whitespace, or are they actually <br/> tags > that > > > > are inserting lines to format the page for HTML display? > > > > > > > > Thanks, > > > > Ash > > > > http://www.ashleysheridan.co.uk > > > > > > > > > > > > > > > > > > > > > > > > -- > > > PHP General Mailing List (http://www.php.net/) > > > To unsubscribe, visit: http://www.php.net/unsub.php > > > > > > > > The PHP_EOL is system dependent. If you want a solution that works on > every > > type of file you have to code it yourself. Here you have a function made > > some time ago. > > Maybe you can improve it. > > > > If you want the result as a text format you can implode( PHP_EOL, > $buffer ) > > Hope this helps you. > > > > function explode($code) > > { > > $lines = array(); > > $buffer = ''; > > > > for($i=0, $len = strlen($code); $i<$len; ++$i) > > switch( $code{$i} ) > > { > > case "\r": > > case "\n": > > if( $i+1 == $len ) > > break 2; > > > > if( "\r" == ($next = $code{ $i+1 }) || "\n" == $next ) > > { > > ++$i; > > } > > > > $lines[] = $buffer; > > $buffer = ''; > > break; > > default: > > $buffer .= $code{$i}; > > } > > > > if( '' !== $buffer ); > > $lines[] = $buffer; > > > > return $lines; > > } > > > > > > -- > > Martin Scotta > > > > > The empty strings are forcing the parameter to be used as a string, otherwise the line would be translated as something like this: $dtd = preg_replace( "/\n/", \n, $dtd); Notice how that newline character is actually just the character by itself, and is not a string. Obviously, the exact end of line character will differ from system to system, but this is a simple example of exactly why you had to concatenate the PHP_EOL with those empty strings. Thanks, Ash http://www.ashleysheridan.co.uk