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#!/usr/bin/perl<br />
my %tr=(<br />
&quot;&amp;&quot;, &quot;&amp;amp;&quot;,<br />
&quot;&lt;&quot;, &quot;&lt;&quot;,<br />
&quot;&gt;&quot;, &quot;&gt;&quot;,<br />
&quot;\&quot;&quot;, &quot;&amp;quot;&quot;,<br />
&quot;\'&quot;, &quot;&amp;apos;&quot;,<br />
);<br />
$_=q(I have to encode the 5 XML reserved chars (&amp; &lt;&nbsp;&gt; &quot;&nbsp;and ') properly as follows:);<br />
s/([&amp;&lt;&gt;&quot;'])/$tr{$1}/g;<br />
print;<br />

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@ozo,<br />
thx, is it possible in Java also the same way? <br />
String s1 = &quot;..........&quot;<br />
String s2 = s1.replaceAll( &quot;[&amp;|&lt;|&gt;|\&quot;|\']&quot; , &quot;what_is_here&quot; )&lt;<br />

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<div class="content wysiwyg-content">
I have to encode the 5 XML reserved chars (&amp; &lt;&nbsp;&gt; &quot;&nbsp;and ') properly as follows:<br />
&quot;&amp;&quot;, &quot;&amp;amp;&quot;<br />
&quot;&lt;&quot;, &quot;&amp;lt;&quot;<br />
&quot;&gt;&quot;, &quot;&amp;gt;&quot;<br />
&quot;\&quot;&quot;, &quot;&amp;quot;&quot;<br />
&quot;\'&quot;, &quot;&amp;apos;&quot;<br />
I can do them one by one, but is it possible in regexp something like (&quot;[&amp;|&lt;|&gt;|\&quot;|\']&quot;, &quot;&amp;amp;|&amp;lt;&quot;); ... etc so that it will not be executed in 5 operations one after another but alltogether simultaneously?<br />

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I have to encode the 5 XML reserved chars (& < > " and ') properly as follows:
"&", "&amp;"
"<", "&lt;"
">", "&gt;"
"\"", "&quot;"
"\'", "&apos;"
I can do them one by one, but is it possible in regexp something like ("[&|<|>|\"|\']", "&amp;|&lt;"); ... etc so that it will not be executed in 5 operations one after another but alltogether simultaneously?


replace a set of characters with another set of chars: &quot;&amp;&quot;, &quot;&amp;amp;&quot; &quot;&lt;&quot;, &quot;&amp;lt;&quot; etc. in regex, but simultaneously

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.

replace a set of characters with another set of chars: &quot;&amp;&quot;, &quot;&amp;amp;&quot; &quot;&lt;&quot;, &quot;&amp;lt;&quot; etc. in regex, but simultaneously

replace a set of characters with another set of chars: "&", "&" "<", "<" etc. in regex, but simultaneously