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PORegular expression to convert/normalize multiline string to single string
 

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    <p>The input is a multi-line string such as this:</p> <pre><code> table { border:0; border-spacing:0; border-collapse:collapse; margin-left:auto; // 'align:center' equivalent margin-right:auto; } </code></pre> <p>The output is a single-line string with "extra" whitespace &amp; comments removed, e.g.:</p> <pre><code> table { border:0; border-spacing:0; border-collapse:collapse; margin-left:auto;} </code></pre> <p>One way to do this with Perl is:</p> <pre><code> #! perl -w use strict; my $css = &lt;&lt;CSS; table { border:0; border-spacing:0; border-collapse:collapse; margin-left:auto; // 'align:center' equivalent margin-right:auto; } CSS $css =~ s/\s{2,}/ /g; # globally replace 2 or more whitespace with 1 space $css =~ s|\s+//.+\n||g; # globally replace C comment with empty string $css =~ s|\n||g; # globally replace newline with empty string print $css; </code></pre> <p>I tried doing something similar in PHP but it does <em>nothing</em> to the input:</p> <pre><code> &lt;?php define("CSS_TABLE", "table { border:0; border-spacing:0; border-collapse:collapse; margin-left:auto; // 'align:center' equivalent margin-right:auto; }"); $css = CSS_TABLE; preg_replace("/\s\s+/", ' ', $css); preg_replace("/\s+\/\/.+\n/", '', $css); preg_replace("/\n/", '', $css); echo("CSS-min: $css\n\n"); ?&gt; </code></pre> <p>Note: the 'define' isn't the issue because I also used a 'here' doc -- no joy either way. I'm showing the 'define' instead of a 'here' doc (as in the Perl example) because the existing PHP code uses it (and a whole bunch of others!).</p> <p>What am I doing wrong?</p>
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