How to use the pygments.lexer.bygroups function in Pygments

'disable debug cxnew copy convertto convertfrom convert connect '
        'complete compare clear checkpoint aggregate add').split()

    commenthelp = (
        'component description example externalhelp forwardhelpcategory '
        'forwardhelptargetname functionality inputs link '
        'notes outputs parameter remotehelprunspace role synopsis').split()

    tokens = {
        'root': [
            # we need to count pairs of parentheses for correct highlight
            # of '$(...)' blocks in strings
            (r'\(', Punctuation, 'child'),
            (r'\s+', Text),
            (r'^(\s*#[#\s]*)(\.(?:%s))([^\n]*$)' % '|'.join(commenthelp),
             bygroups(Comment, String.Doc, Comment)),
            (r'#[^\n]*?$', Comment),
            (r'(<|<)#', Comment.Multiline, 'multline'),
            (r'@"\n', String.Heredoc, 'heredoc-double'),
            (r"@'\n.*?\n'@", String.Heredoc),
            # escaped syntax
            (r'`[\'"$@-]', Punctuation),
            (r'"', String.Double, 'string'),
            (r"'([^']|'')*'", String.Single),
            (r'(\$|@@|@)((global|script|private|env):)?\w+',
             Name.Variable),
            (r'(%s)\b' % '|'.join(keywords), Keyword),
            (r'-(%s)\b' % '|'.join(operators), Operator),
            (r'(%s)-[a-z_]\w*\b' % '|'.join(verbs), Name.Builtin),
            (r'\[[a-z_\[][\w. `,\[\]]*\]', Name.Constant),  # .net [type]s
            (r'-[a-z_]\w*', Name),
            (r'\w+', Name),

Comment.Single)),
            (r'(?=%s)' % _start_label, Text, 'follow%s' % suffix),
            (_space, using(this, state='text')),
            include('redirect%s' % suffix),
            (r'[%s]+' % _nl, Text),
            (r'\(', Punctuation, 'root/compound'),
            (r'@+', Punctuation),
            (r'((?:for|if|rem)(?:(?=(?:\^[%s]?)?/)|(?:(?!\^)|'
             r'(?<=m))(?:(?=\()|%s)))(%s?%s?(?:\^[%s]?)?/(?:\^[%s]?)?\?)' %
             (_nl, _token_terminator, _space,
              _core_token_compound if compound else _core_token, _nl, _nl),
             bygroups(Keyword, using(this, state='text')),
             'follow%s' % suffix),
            (r'(goto%s)(%s(?:\^[%s]?)?/(?:\^[%s]?)?\?%s)' %
             (_keyword_terminator, rest, _nl, _nl, rest),
             bygroups(Keyword, using(this, state='text')),
             'follow%s' % suffix),
            (words(('assoc', 'break', 'cd', 'chdir', 'cls', 'color', 'copy',
                    'date', 'del', 'dir', 'dpath', 'echo', 'endlocal', 'erase',
                    'exit', 'ftype', 'keys', 'md', 'mkdir', 'mklink', 'move',
                    'path', 'pause', 'popd', 'prompt', 'pushd', 'rd', 'ren',
                    'rename', 'rmdir', 'setlocal', 'shift', 'start', 'time',
                    'title', 'type', 'ver', 'verify', 'vol'),
                   suffix=_keyword_terminator), Keyword, 'follow%s' % suffix),
            (r'(call)(%s?)(:)' % _space,
             bygroups(Keyword, using(this, state='text'), Punctuation),
             'call%s' % suffix),
            (r'call%s' % _keyword_terminator, Keyword),
            (r'(for%s(?!\^))(%s)(/f%s)' %
             (_token_terminator, _space, _token_terminator),
             bygroups(Keyword, using(this, state='text'), Keyword),
             ('for/f', 'for')),

(r'\!\w+', Other),
            (r'\s', Text),
            (r'=>', Operator),
            (r'[\&\|]', Operator),
            (r'[\(\)]', Punctuation),
            (r'\[', Text, 'intercycle-offset'),
            (r'.', Comment)
        ],

        'inter-suite-trigger': [
            (r'(\<)'
             r'([^\>]+)'  # foreign suite
             r'(::)'
             r'([^\>]+)'  # foreign task
             r'(\>)',
             bygroups(Text, EXTERNAL_SUITE_TOKEN, Text,
                      PARAMETERISED_TASK_TOKEN, Text)),
        ],

        # Parameterised syntax:  
        'parameterisation': [
            (r'(\<)'  # Opening greater-than bracket.
             r'(\s?\w+\s?'  # Parameter name (permit whitespace).
             r'(?:[+-=]\s?\w+)?'  # [+-=] for selecting parameters.
             r'\s?'  # Permit whitespace.
             r'(?:'  # BEGIN optional extra parameter groups...
             r'(?:\s?,\s?\w+\s?'  # Comma separated parameters.
             r'(?:[+-=]\s?\w+)?'  # [+-=] for selecting parameters.
             r'\s?)'  # Permit whitespace.
             r'+)?'  # ...END optional extra parameter groups.
             r')(\>)',  # Closing lesser-than bracket.
             bygroups(Text, PARAMETERISED_TASK_TOKEN, Text)),

filenames = ['*.mao']
    mimetypes = ['application/x-mako']

    tokens = {
        'root': [
            (r'(\s*)(%)(\s*end(?:\w+))(\n|\Z)',
             bygroups(Text, Comment.Preproc, Keyword, Other)),
            (r'(\s*)(%)([^\n]*)(\n|\Z)',
             bygroups(Text, Comment.Preproc, using(PythonLexer), Other)),
            (r'(\s*)(##[^\n]*)(\n|\Z)',
             bygroups(Text, Comment.Preproc, Other)),
            (r'(?s)<%doc>.*?', Comment.Preproc),
            (r'(<%)([\w.:]+)',
             bygroups(Comment.Preproc, Name.Builtin), 'tag'),
            (r'()',
             bygroups(Comment.Preproc, Name.Builtin, Comment.Preproc)),
            (r'<%(?=([\w.:]+))', Comment.Preproc, 'ondeftags'),
            (r'(<%(?:!?))(.*?)(%>)(?s)',
             bygroups(Comment.Preproc, using(PythonLexer), Comment.Preproc)),
            (r'(\$\{)(.*?)(\})',
             bygroups(Comment.Preproc, using(PythonLexer), Comment.Preproc)),
            (r'''(?sx)
                (.+?)                # anything, followed by:
                (?:
                 (?<=\n)(?=%|\#\#) | # an eval or comment line
                 (?=\#\*) |          # multiline comment
                 (?=

'literals': [
            (r'\b-?[\d_]+(ns|ms|sec|min|hr|day)', Number),   #Duration
            (r'\b-?[\d_]*\.[\d_]+(ns|ms|sec|min|hr|day)', Number),
                                                             #Duration with dot
            (r'\b-?(\d+)?\.\d+(f|F|d|D)?', Number.Float),    #Float/Decimal
            (r'\b-?0x[0-9a-fA-F_]+', Number.Hex),            #Hex
            (r'\b-?[\d_]+', Number.Integer),                 #Int
            (r"'\\.'|'[^\\]'|'\\u[0-9a-f]{4}'", String.Char), #Char
            (r'"', Punctuation, 'insideStr'),                #Opening quote
            (r'`', Punctuation, 'insideUri'),                #Opening accent
            (r'\b(true|false|null)\b', Keyword.Constant),    #Bool & null
            (r'(?:(\w+)(::))?(\w+)(<\|)(.*?)(\|>)',          #DSL
             bygroups(Name.Namespace, Punctuation, Name.Class,
                      Punctuation, String, Punctuation)),
            (r'(?:(\w+)(::))?(\w+)?(#)(\w+)?',               #Type/slot literal
             bygroups(Name.Namespace, Punctuation, Name.Class,
                      Punctuation, Name.Function)),
            (r'\[,\]', Literal),                             # Empty list
            (s(r'($type)(\[,\])'),                           # Typed empty list
             bygroups(using(this, state = 'inType'), Literal)),
            (r'\[:\]', Literal),                             # Empty Map
            (s(r'($type)(\[:\])'),
             bygroups(using(this, state = 'inType'), Literal)),
        ],
        'insideStr': [
            (r'\\\\', String.Escape),                        #Escaped backslash
            (r'\\"', String.Escape),                         #Escaped "
            (r'\\`', String.Escape),                         #Escaped `
            (r'\$\w+', String.Interpol),                     #Subst var
            (r'\${.*?}', String.Interpol),                   #Subst expr
            (r'"', Punctuation, '#pop'),                     #Closing quot
            (r'.', String)                                   #String content

Text, Punctuation, Text, Name.Class)),
            (r'\b(Type)([ \t]+)(%s)' % (bb_name),
             bygroups(Keyword.Reserved, Text, Name.Class)),
            # Keywords
            (r'\b(Pi|True|False|Null)\b', Keyword.Constant),
            (r'\b(Local|Global|Const|Field|Dim)\b', Keyword.Declaration),
            (words((
                'End', 'Return', 'Exit', 'Chr', 'Len', 'Asc', 'New', 'Delete', 'Insert',
                'Include', 'Function', 'Type', 'If', 'Then', 'Else', 'ElseIf', 'EndIf',
                'For', 'To', 'Next', 'Step', 'Each', 'While', 'Wend',
                'Repeat', 'Until', 'Forever', 'Select', 'Case', 'Default',
                'Goto', 'Gosub', 'Data', 'Read', 'Restore'), prefix=r'\b', suffix=r'\b'),
             Keyword.Reserved),
            # Final resolve (for variable names and such)
            # (r'(%s)' % (bb_name), Name.Variable),
            (bb_var, bygroups(Name.Variable, Text, Keyword.Type,
                              Text, Punctuation, Text, Name.Class)),
        ],
        'string': [
            (r'""', String.Double),
            (r'"C?', String.Double, '#pop'),
            (r'[^"]+', String.Double),
        ],
    }


class MonkeyLexer(RegexLexer):
    """
    For
    `Monkey `_
    source code.

(r'\{', String.Escape, 'msgname'),
            (r'\}', String.Escape, '#pop'),
            (r'(,)(\s*)([a-z]+)(\s*\})',
             bygroups(Operator, String.Escape, Keyword, String.Escape), '#pop'),
            (r'(,)(\s*)([a-z]+)(\s*)(,)(\s*)(offset)(\s*)(:)(\s*)(-?\d+)(\s*)',
             bygroups(Operator, String.Escape, Keyword, String.Escape, Operator,
                      String.Escape, Operator.Word, String.Escape, Operator,
                      String.Escape, Number.Integer, String.Escape), 'choice'),
            (r'(,)(\s*)([a-z]+)(\s*)(,)(\s*)',
             bygroups(Operator, String.Escape, Keyword, String.Escape, Operator,
                      String.Escape), 'choice'),
            (r'\s+', String.Escape)
        ],
        'choice': [
            (r'(=|<|>|<=|>=|!=)(-?\d+)(\s*\{)',
             bygroups(Operator, Number.Integer, String.Escape), 'message'),
            (r'([a-z]+)(\s*\{)', bygroups(Keyword.Type, String.Escape), 'str'),
            (r'\}', String.Escape, ('#pop', '#pop')),
            (r'\s+', String.Escape)
        ],
        'str': [
            (r'\}', String.Escape, '#pop'),
            (r'\{', String.Escape, 'msgname'),
            (r'[^{}]+', String)
        ]
    }

    def analyse_text(text):
        if text.startswith('root:table'):
            return 1.0

##----------------------------------------------------------------------
## Cisco.ASA highlight lexers
##----------------------------------------------------------------------
## Copyright (C) 2007-2009 The NOC Project
## See LICENSE for details
##----------------------------------------------------------------------
from pygments.lexer import RegexLexer, bygroups
from pygments.token import *


class ConfigLexer(RegexLexer):
    name = "Cisco.ASA"
    tokens = {
        "root": [
            (r"^!.*", Comment),
            (r"(password)(\s+\S+\s+)(encrypted)", bygroups(Keyword, String.Double, Keyword)),
            (r"^(interface|router\s+\S+)(.*?)$", bygroups(Keyword, Name.Attribute)),
            (r"^(group-policy)(\s+\S+\s+)(\S+)", bygroups(Keyword, Name.Attribute, Keyword)),
            (r"(nameif\s+)(.*?)$", bygroups(Keyword, Name.Attribute)),
            (r"(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})(/\d{1,2})?", Number),  # IPv4 Address/Prefix
            (r"^(?:no\s+)?\S+", Keyword),
            (r"\d+", Number),
            (r".", Text),
        ]

# everything else is text
            (r'\S+', Text),
        ],
        'stackeffect': [
            (r'\s+', Text),
            (r'\(\s+', Name.Function, 'stackeffect'),
            (r'\)\s', Name.Function, '#pop'),
            (r'--\s', Name.Function),
            (r'\S+', Name.Variable),
        ],
        'slots': [
            (r'\s+', Text),
            (r';\s', Keyword, '#pop'),
            (r'(\{\s+)(\S+)(\s[^}]+\s\}\s)',
             bygroups(Text, Name.Variable, Text)),
            (r'\S+', Name.Variable),
        ],
        'vocabs': [
            (r'\s+', Text),
            (r';\s', Keyword, '#pop'),
            (r'\S+', Name.Namespace),
        ],
        'classes': [
            (r'\s+', Text),
            (r';\s', Keyword, '#pop'),
            (r'\S+', Name.Class),
        ],
        'words': [
            (r'\s+', Text),
            (r';\s', Keyword, '#pop'),
            (r'\S+', Name.Function),