    <p>Parameters:</p>

    <ul>
    <li><code>lexer</code>: The parent lexer.</li>
    <li><code>child</code>: The child lexer.</li>
    <li><code>start_rule</code>: The pattern that signals the beginning of the embedded
    lexer.</li>
    <li><code>end_rule</code>: The pattern that signals the end of the embedded lexer.</li>
    </ul>


    <p>Usage:</p>

    <ul>
    <li><code>html:embed(css, css_start_rule, css_end_rule)</code></li>
    <li><code>html:embed(lex, php_start_rule, php_end_rule) -- from ph