Generic language syntax highlighting for Hyperlight, which is a PHP-based syntax highlighter: http://code.google.com/p/hyperlight/ Tested with: Java, C#, JavaScript, AS3, C, C++, Lua

code.css

.code {
	font-family: Consolas, 'Lucida Console', monospace;
	font-size: 85%;
	line-height: 1.5em;
	color: #000;
	border: 1px solid #DBDBDB;
	padding: 0.5em;
	margin-bottom: 1.25em;
	white-space: nowrap;
	max-height: 600px;
	background-color: #F5F5F5;
	overflow: auto;
}
.code .comment {
	color: #00a452;
	font-style: italic;
}
.code .identifier {
	color: #000080;
}
.code .keyword {
	color: #000080;
	font-weight: bold;
}
.code .method, .code .ctor {
	font-weight: bold;
}
.code .operator {
	color: #0000ff;
}
.code .string {
	color: #408080;
}

generic.php

<?php

// Highlights most languages reasonably: Java, C#, JavaScript, AS3, C, C++, Lua
class GenericLanguage extends HyperLanguage {
	public function __construct() {
		$this->setInfo(array(
			parent::NAME => 'Generic',
			parent::VERSION => '0.1',
			parent::AUTHOR => array(
				parent::NAME => 'Nathan Sweet', // based Konrad Rudolph's csharp.php!
				parent::WEBSITE => 'esotericsoftware.com',
				parent::EMAIL => 'misc@n4te.com'
			)
		));

		$this->setExtensions(array('java', 'cs', 'js', 'as', 'c', 'cpp', 'lua'));

		$this->setCaseInsensitive(false);

		$this->addStates(array(
			'init' => array(
				'string',
				'char',
				'number',
				'comment',
				'keyword' => array('', 'preprocessor'),
				'method',
				'ctor',
				'function',
				'operator',
				'type',
				'identifier',
				'whitespace',
			),
		));

		$this->addRules(array(
			'whitespace' => Rule::ALL_WHITESPACE,
			'operator' => '/[-+*\/%&|^!~=<>?{}()\[\].,:;]|&&|\|\||<<|>>|[-=!<>+*\/%&|^]=|<<=|>>=|->/',
			'string' => Rule::C_DOUBLEQUOTESTRING,
			'char' => Rule::C_SINGLEQUOTESTRING,
			'number' => Rule::C_NUMBER,
			'comment' => '#(//|--)(?:[^/].*?)?(\n|\z)|/\*.*?\*/#s',
			'keyword' => array(
				array(
					// C#
					'abstract', 'break', 'case', 'catch', 'checked', 'class',
					'const', 'continue', 'default', 'delegate', 'do', 'else',
					'enum', 'explicit', 'extern', 'finally', 'fixed',
					'for', 'foreach', 'goto', 'if', 'implicit', 'in', 'interface',
					'internal', 'lock', 'namespace', 'operator', 'out', 'override',
					'params', 'private', 'protected', 'public', 'readonly', 'ref',
					'return', 'sealed', 'static', 'struct', 'switch', 'throw',
					'try', 'unchecked', 'unsafe', 'using', 'var', 'virtual',
					'volatile', 'while',
					'bool', 'byte', 'char', 'decimal', 'double', 'float', 'int',
					'long', 'object', 'sbyte', 'short', 'string', 'uint', 'ulong',
					'ushort', 'void',
					'base', 'false', 'null', 'this', 'true',
					'as', 'is', 'new', 'sizeof', 'stackallock', 'typeof',
					// Java
					'extends', 'throws', 'implements',
					'final', 'native', 'synchronized', 
					'transient', 'assert',
					'package', 'strictfp', 'super',
					'import', 'boolean', 'instanceof',
					// JavaScript
					'function',
					// Lua
					'local', 'not', 'then', 'end', 'nil', 'pairs', 'ipairs', 'and', 'or',
					// C
					'typedef', 'auto', 'extern', 'goto', 'register', 'signed', 'sizeof', 'struct', 'union', 'unsigned',
					// C++
					'alignas', 'alignof', 'and_eq', 'asm', 'bitand', 'bitor', 'char16_t', 'char32_t', 'compl', 'constexpr',
					'const_cast', 'decltype', 'delete', 'dynamic_cast', 'explicit', 'export', 'friend', 'inline', 'mutable', 
					'noexcept', 'not_eq', 'nullptr', 'or_eq', 'reinterpret_cast', 'static_assert', 'static_cast', 'template', 
					'thread_local', 'typeid', 'typename', 'wchar_t', 'xor', 'xor_eq',
				),
				'preprocessor' => '/#(?:if|else|elif|endif|define|undef|warning|error|line|region|endregion|include|import)[^\r\n]*/',
			),
			'method' => '/(?<=\.)\s*([a-zA-Z][^\s\.\(:]+)(?=\s*\()/',
			'ctor' => '/(?<=new)\s+([a-zA-Z][^\s\(:]+)(?=\s*\()/',
			'function' => '/([a-zA-Z][^\s\.\(:]+)(?=\s*\()/',
			'type' => '/@?(sp)?[A-Z][a-z0-9_]*/',
			'identifier' => '/@?[a-z_][a-z0-9_]*/i',
		));

		$this->addMappings(array(
			'whitespace' => '',
		));
	}
}

?>