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<h2 class="chapter">12 Regexp building and testing tool</h2>
<p>If you have not use <samp><span class="command">re-builder</span></samp>, please try it. The tool is
quite simple and useful, you just input regexp in the *RE-Builder*
buffer, the matched part in the buffer where the command is called will
be highlighted.
<p><samp><span class="file">re-builder-x.el</span></samp> extend the regexp syntax to perl or any other
languages. To enable perl regexp syntax, you have to change the syntax
to perl first. The command is <samp><span class="command">reb-change-syntax</span></samp>, which is
bound to C-c TAB.
<p>In consideration of efficiency, if you make some changes in the buffer,
the regexp will not apply in the new text unless you send current buffer
to perl process again. You can do that by using command
<samp><span class="command">reb-perl-send-buffer</span></samp> which bound to C-c C-a.
<p>All commands for re-builder are available for perl syntax.
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