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POHow can I search for two sequential newlines (\n) using perl?
 

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  1. POHow can I search for two sequential newlines (\n) using perl?
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    <p>How can I search for two sequential newlines (\n) using perl? Or more specifically, why is a search for \n\n not successful even when they exist? I have a file with sequential newlines (verfied with a hex editor, they are not returns, etc.) but perl doesn't seem accept this regex.</p> <p>perl -pi -e 's/\n\n/TEST/g' myfile.xml <strong>= no results</strong></p> <p>I'm actually trying to insert a bit of code into XML files but the linefeeds are in the middle, what's the most elegant way of doing so? I came up with a monstrous perl one liner but the double line feeds seem to cause the failure.</p> <p>I want to change a portion of a gtkrc file from:</p> <pre><code>GtkWidget::link-color = @link_color GtkWidget::visited-link-color = @text_color #################### # Color Definitions #################### </code></pre> <p>to:</p> <pre><code>GtkWidget::link-color = @link_color GtkWidget::visited-link-color = @text_color GtkWindow::resize-grip-height = 0 GtkWindow::resize-grip-width = 0 #################### # Color Definitions #################### </code></pre> <p>Using the a portion of the original code as my search term (there are tabs before each line on the original script, btw), my find and replace terms were:</p> <pre><code>color\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color color\n\n\tGtkWindow::resize-grip-height = 0\n\tGtkWindow::resize-grip-width = 0\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color </code></pre> <p>I came up with this big ugly perl command:</p> <pre><code>perl -pi -e 's/color\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color/color\n\n\tGtkWindow::resize-grip-height = 0\n\tGtkWindow::resize-grip-width = 0\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color/g' /usr/share/themes/Ambiance/gtk-2.0/gtkrc </code></pre> <p>EDIT: Corrected code from Zaid:</p> <pre><code>perl -0777 -pi -e 's/color\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color/color\n\n\tGtkWindow::resize-grip-height = 0\n\tGtkWindow::resize-grip-width = 0\n\n\t\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\n\t\# Color/g' /usr/share/themes/Ambiance/gtk-2.0/gtkrc </code></pre> <p>As mentioned, it seems to be the \n\n that causes issues as anything else can be replaced. What is the better way to do this?</p> <p>I'm on Ubuntu 11.10, command will be run from shell script and not perl script.</p>
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