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diff --git a/pygments/lexers/kotlin.py b/pygments/lexers/kotlin.py
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+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.kotlin
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for the Kotlin programming language.
+    http://confluence.jetbrains.net/display/Kotlin/
+
+    :copyright: Copyright 2006-2012 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+import re
+
+from pygments.lexer import RegexLexer, DelegatingLexer, bygroups, include, \
+     using, this
+from pygments.token import Punctuation, \
+     Text, Comment, Operator, Keyword, Name, String, Number, Literal, Other
+from pygments.util import get_choice_opt
+from pygments import unistring as uni
+
+from pygments.lexers.web import XmlLexer
+
+__all__ = ['KotlinLexer']
+
+
+def _escape(st):
+    return st.replace(u'\\', ur'\\').replace(u'-', ur'\-').\
+           replace(u'[', ur'\[').replace(u']', ur'\]')
+
+class KotlinLexer(RegexLexer):
+    """
+    For `Kotlin <http://confluence.jetbrains.net/display/Kotlin/>`_
+    source code.
+
+    Additional options accepted:
+
+    `unicodelevel`
+      Determines which Unicode characters this lexer allows for identifiers.
+      The possible values are:
+
+      * ``none`` -- only the ASCII letters and numbers are allowed. This
+        is the fastest selection.
+      * ``basic`` -- all Unicode characters from the specification except
+        category ``Lo`` are allowed.
+      * ``full`` -- all Unicode characters as specified in the C# specs
+        are allowed.  Note that this means a considerable slowdown since the
+        ``Lo`` category has more than 40,000 characters in it!
+
+      The default value is ``basic``.
+
+      *New in Pygments 0.8.*
+    """
+
+    name = 'Kotlin'
+    aliases = ['kotlin']
+    filenames = ['*.kt']
+    mimetypes = ['text/x-kotlin'] # inferred
+
+    flags = re.MULTILINE | re.DOTALL | re.UNICODE
+
+    # for the range of allowed unicode characters in identifiers,
+    # see http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-334.pdf
+
+    levels = {
+        'none': '@?[_a-zA-Z][a-zA-Z0-9_]*',
+        'basic': ('@?[_' + uni.Lu + uni.Ll + uni.Lt + uni.Lm + uni.Nl + ']' +
+                  '[' + uni.Lu + uni.Ll + uni.Lt + uni.Lm + uni.Nl +
+                  uni.Nd + uni.Pc + uni.Cf + uni.Mn + uni.Mc + ']*'),
+        'full': ('@?(?:_|[^' +
+                 _escape(uni.allexcept('Lu', 'Ll', 'Lt', 'Lm', 'Lo', 'Nl')) + '])'
+                 + '[^' + _escape(uni.allexcept('Lu', 'Ll', 'Lt', 'Lm', 'Lo',
+                                                'Nl', 'Nd', 'Pc', 'Cf', 'Mn',
+                                                'Mc')) + ']*'),
+    }
+
+    tokens = {}
+    token_variants = True
+
+    for levelname, cs_ident in levels.items():
+        tokens[levelname] = {
+            'root': [
+                # method names
+                (r'^([ \t]*(?:' + cs_ident + r'(?:\[\])?\s+)+?)' # return type
+                 r'(' + cs_ident + ')'                           # method name
+                 r'(\s*)(\()',                               # signature start
+                 bygroups(using(this), Name.Function, Text, Punctuation)),
+                (r'^\s*\[.*?\]', Name.Attribute),
+                (r'[^\S\n]+', Text),
+                (r'\\\n', Text), # line continuation
+                (r'//.*?\n', Comment.Single),
+                (r'/[*](.|\n)*?[*]/', Comment.Multiline),
+                (r'\n', Text),
+                (r'[~!%^&*()+=|\[\]:;,.<>/?-]', Punctuation),
+                (r'[{}]', Punctuation),
+                (r'@"(""|[^"])*"', String),
+                (r'"(\\\\|\\"|[^"\n])*["\n]', String),
+                (r"'\\.'|'[^\\]'", String.Char),
+                (r"[0-9](\.[0-9]*)?([eE][+-][0-9]+)?"
+                 r"[flFLdD]?|0[xX][0-9a-fA-F]+[Ll]?", Number),
+                (r'#[ \t]*(if|endif|else|elif|define|undef|'
+                 r'line|error|warning|region|endregion|pragma)\b.*?\n',
+                 Comment.Preproc),
+                (r'\b(extern)(\s+)(alias)\b', bygroups(Keyword, Text,
+                 Keyword)),
+                (r'(abstract|as|break|catch|'
+                 r'fun|continue|default|delegate|'
+                 r'do|else|enum|extern|false|finally|'
+                 r'fixed|for|goto|if|implicit|in|interface|'
+                 r'internal|is|lock|null|'
+                 r'out|override|private|protected|public|readonly|'
+                 r'ref|return|sealed|sizeof|'
+                 r'when|this|throw|true|try|typeof|'
+                 r'unchecked|unsafe|virtual|void|while|'
+                 r'get|set|new|partial|yield|val|var)\b', Keyword),
+                (r'(global)(::)', bygroups(Keyword, Punctuation)),
+                (r'(bool|byte|char|decimal|double|dynamic|float|int|long|short)\b\??', Keyword.Type),
+                (r'(class|struct)(\s+)', bygroups(Keyword, Text), 'class'),
+                (r'(package|using)(\s+)', bygroups(Keyword, Text), 'package'),
+                (cs_ident, Name),
+            ],
+            'class': [
+                (cs_ident, Name.Class, '#pop')
+            ],
+            'package': [
+                (r'(?=\()', Text, '#pop'), # using (resource)
+                ('(' + cs_ident + r'|\.)+', Name.Namespace, '#pop')
+            ]
+        }
+
+    def __init__(self, **options):
+        level = get_choice_opt(options, 'unicodelevel', self.tokens.keys(), 'basic')
+        if level not in self._all_tokens:
+            # compile the regexes now
+            self._tokens = self.__class__.process_tokendef(level)
+        else:
+            self._tokens = self._all_tokens[level]
+
+        RegexLexer.__init__(self, **options)