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    <blockquote> <p>but outside of a situation like that, &lt;% would always indicate the start of a code block.</p> </blockquote> <p>In that case, first scan the file for your embedded code, and once you have those, parse your embedded code with a dedicated parser (without the noise before the <code>&lt;%</code> and after the <code>%&gt;</code> tags).</p> <p>ANTLR has the option to let the lexer parse just a (small) part of an input file and ignore the rest. Note that you cannot create a "combined grammar" (parser and lexer in one) in that case. Here's how you can create such a "partial lexer":</p> <pre><code>// file EmbeddedCodeLexer.g lexer grammar EmbeddedCodeLexer; options{filter=true;} // &lt;- enables the partial lexing! EmbeddedCode : '&lt;%' // match an open tag ( String // ( match a string literal | ~('%' | '\'') // OR match any char except `%` and `'` | {input.LT(2) != '&gt;'}?=&gt; '%' // OR only match a `%` if `&gt;` is not ahead of it )* // ) &lt;- zero or more times '%&gt;' // match a close tag ; fragment String : '\'' ('\\' . | ~('\'' | '\\'))* '\'' ; </code></pre> <p>If you now create a lexer from it:</p> <pre><code>java -cp antlr-3.2.jar org.antlr.Tool EmbeddedCodeLexer.g </code></pre> <p>and create a little test harness:</p> <pre><code>import org.antlr.runtime.*; public class Main { public static void main(String[] args) throws Exception { String source = "Lorem ipsum dolor sit amet \n"+ "&lt;% \n"+ "a = 2 &gt; 1 &amp;&amp; 10 % 3; \n"+ "print('consectetur %&gt; adipiscing elit'); \n"+ "%&gt; \n"+ "Phasellus volutpat dignissim sapien. \n"+ "foo &lt;% more code! %&gt; bar \n"; ANTLRStringStream in = new ANTLRStringStream(source); EmbeddedCodeLexer lexer = new EmbeddedCodeLexer(in); CommonTokenStream tokens = new CommonTokenStream(lexer); for(Object o : tokens.getTokens()) { System.out.println("=======================================\n"+ "EmbeddedCode = "+((Token)o).getText()); } } } </code></pre> <p>compile it all:</p> <pre><code>javac -cp antlr-3.2.jar *.java </code></pre> <p>and finally run the Main class by doing:</p> <pre><code>// *nix/MacOS java -cp .:antlr-3.2.jar Main // Windows java -cp .;antlr-3.2.jar Main </code></pre> <p>it will produce the following output:</p> <pre><code>======================================= EmbeddedCode = &lt;% a = 2 &gt; 1 &amp;&amp; 10 % 3; print('consectetur %&gt; adipiscing elit'); %&gt; ======================================= EmbeddedCode = &lt;% more code! %&gt; </code></pre>
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