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Top Forums Shell Programming and Scripting sed replacing specific characters and control characters by escaping Post 302631425 by Scrutinizer on Friday 27th of April 2012 10:00:45 AM
Old 04-27-2012
Hi why don't you try it yourself? But it would be preferable to use single quotes instead of double quotes, to prevent the shell from nibbling away at the back slashes in front of some characters ( $ ` " \ and <newline> ), so sed will not see them.

Code:
echo "\\\`\$\ 
\""

produces:
Code:
\`$"

Also by putting \ in front of some of the normal characters, you are introducing a special meaning:

Code:
$ echo ntrv | sed -n "/\n\t\r\v/p"
$ echo ntrv | sed -n "/ntrv/p"
ntrv

 

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HTMLSPECIALCHARS_DECODE(3)						 1						HTMLSPECIALCHARS_DECODE(3)

htmlspecialchars_decode - Convert special HTML entities back to characters

SYNOPSIS
string htmlspecialchars_decode (string $string, [int $flags = ENT_COMPAT | ENT_HTML401]) DESCRIPTION
This function is the opposite of htmlspecialchars(3). It converts special HTML entities back to characters. The converted entities are: &amp;, &quot; (when ENT_NOQUOTES is not set), &#039; (when ENT_QUOTES is set), &lt; and &gt;. PARAMETERS
o $string - The string to decode. o $flags - A bitmask of one or more of the following flags, which specify how to handle quotes and which document type to use. The default is ENT_COMPAT | ENT_HTML401. Available $flags constants +--------------+---------------------------------------------------+ |Constant Name | | | | | | | Description | | | | +--------------+---------------------------------------------------+ | | | | ENT_COMPAT | | | | | | | Will convert double-quotes and leave single- | | | quotes alone. | | | | | | | | ENT_QUOTES | | | | | | | Will convert both double and single quotes. | | | | | | | |ENT_NOQUOTES | | | | | | | Will leave both double and single quotes uncon- | | | verted. | | | | | | | | ENT_HTML401 | | | | | | | Handle code as HTML 4.01. | | | | | | | | ENT_XML1 | | | | | | | Handle code as XML 1. | | | | | | | | ENT_XHTML | | | | | | | Handle code as XHTML. | | | | | | | | ENT_HTML5 | | | | | | | Handle code as HTML 5. | | | | +--------------+---------------------------------------------------+ RETURN VALUES
Returns the decoded string. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | The constants ENT_HTML401, ENT_XML1, ENT_XHTML | | | and ENT_HTML5 were added. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 A htmlspecialchars_decode(3) example <?php $str = "<p>this -&gt; &quot;</p> "; echo htmlspecialchars_decode($str); // note that here the quotes aren't converted echo htmlspecialchars_decode($str, ENT_NOQUOTES); ?> The above example will output: <p>this -> "</p> <p>this -> &quot;</p> SEE ALSO
htmlspecialchars(3), html_entity_decode(3), get_html_translation_table(3). PHP Documentation Group HTMLSPECIALCHARS_DECODE(3)
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