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/usr/share/highlight/langDefs/httpd.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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-- FIXME omitted definition of $KEYWORDS(KWA)
-- FIXME omitted definition of $KEYWORDS(KWB)
-- Language definition generated by lang2to3

Description="Apache Config"

Identifiers=[[ [a-zA-Z_][\w\-]* ]]

Keywords={
  { Id=1,
    List={"AccessConfig", "AccessFileName", "Action", "AddAlt", "AddAltByEncoding", "AddAltByType", "AddCharset", "AddDefaultCharset", "AddDescription", "AddEncoding", "AddHandler", "AddIcon", "AddIconByEncoding", "AddIconByType", "AddLanguage", "AddModule", "AddModuleInfo", "AddType", "AgentLog", "Alias", "AliasMatch", "Allow", "AllowCONNECT", "AllowOverride", "Anonymous", "Anonymous_Authoritative", "Anonymous_LogEmail", "Anonymous_MustGiveEmail", "Anonymous_NoUserID", "Anonymous_VerifyEmail", "AuthAuthoritative", "AuthDBAuthoritative", "AuthDBGroupFile", "AuthDBMAuthoritative", "AuthDBMGroupFile", "AuthDBMGroupFile", "AuthDBMUserFile", "AuthDBUserFile", "AuthDigestFile", "AuthGroupFile", "AuthName", "AuthType", "AuthUserFile", "BindAddress", "BrowserMatch", "BrowserMatchNoCase", "BS2000Account", "CacheDefaultExpire", "CacheDirLength", "CacheDirLevels", "CacheForceCompletion", "CacheGcInterval", "CacheLastModifiedFactor", "CacheMaxExpire", "CacheNegotiatedDocs", "CacheRoot", "CacheSize", "CheckSpelling", "ClearModuleList", "ContentDigest", "CookieExpires", "CookieLogCookieLog", "CookieTracking", "CoreDumpDirectory", "CustomLog", "DefaultIcon", "DefaultLanguage", "DefaultType", "Deny", "DirectoryIndex", "DocumentRoot", "ErrorDocument", "ErrorLog", "Example", "ExpiresActive", "ExpiresByType", "ExpiresDefault", "ExtendedStatus", "FancyIndexing", "ForceType", "Group", "Header", "HeaderName", "HostNameLookups", "IdentityCheck", "ImapBase", "ImapDefault", "ImapMenu", "Include", "IndexIgnore", "IndexOptions", "IndexOrderDefault", "ISAPIAppendLogToErrors", "ISAPIAppendLogToQuery", "ISAPILogNotSupported", "ISAPIReadAheadBuffer", "KeepAlive", "KeepAliveTimeout", "LanguagePriority", "LimitRequestBody", "LimitRequestFields", "LimitRequestFieldsize", "LimitRequestLine", "Listen", "ListenBacklog", "LoadFile", "LoadModule", "LockFile", "LogFormat", "LogLevel", "MaxClients", "MaxKeepAliveRequests", "MaxRequestsPerChild", "MaxSpareServers", "MetaDir", "MetaFiles", "MetaSuffix", "MimeMagicFile", "MinSpareServers", "MMapFile", "NameVirtualHost", "NoCache", "Options", "Order", "PassEnv", "PidFile", "Port", "ProxyBlock", "ProxyDomain", "ProxyPass", "ProxyPassReverse", "ProxyReceiveBufferSize", "ProxyRemote", "ProxyRequests", "ProxyVia", "ReadmeName", "Redirect", "RedirectMatch", "RedirectPermanent", "RedirectTemp", "RefererIgnore", "RefererLog", "RemoveEncoding", "RemoveHandler", "RemoveType", "Require", "ResourceConfig", "RewriteBase", "RewriteCond", "RewriteEngine", "RewriteLock", "RewriteLog", "RewriteLogLevel", "RewriteMap", "RewriteOptions", "RewriteRule", "RLimitCPU", "RLimitMEM", "RLimitNPROC", "Satisfy", "ScoreBoardFile", "Script", "ScriptAlias", "ScriptAliasMatch", "ScriptInterpreterSource", "ScriptLog", "ScriptLogBuffer", "ScriptLogLength", "SendBufferSize", "ServerAdmin", "ServerAlias", "ServerName", "ServerPath", "ServerRoot", "ServerSignature", "ServerTokens", "ServerType", "SetEnv", "SetEnvIf", "SetEnvIfNoCase", "SetHandler", "StartServers", "ThreadsPerChild", "TimeOut", "TransferLog", "TypesConfig", "UnsetEnv", "UseCanonicalName", "User", "UserDir", "VirtualDocumentRoot", "VirtualDocumentRootIP", "VirtualScriptAlias", "VirtualScriptAliasIP", "XBitHack"},
  },
  { Id=2,
    List={"alert", "All", "any", "Ascending", "AuthConfig", "Basic", "block", "cgi-script", "CONNECT", "COPY", "crit", "Date", "debug", "DELETE", "Descending", "Description", "Digest", "dns", "double", "EMail", "emerg", "error", "ExecCGI", "FileInfo", "FollowSymLinks", "formatted", "from", "Full", "GET", "Host", "imap-file", "Includes", "IncludesNOEXEC", "Indexes", "inetd", "info", "isapi-isa", "Limit", "LOCK", "map", "max", "Minimal", "MKCOL", "MOVE", "MultiViews", "Name", "nocontent", "None", "notice", "Off", "On", "OS", "PATCH", "POST", "ProductOnly", "PROPFIND", "PROPPATCH", "PUT", "referer", "Remote_Addr", "Remote_Host", "Remote_User", "Request_Method", "Request_Protocol", "Request_URI", "semiformatted", "send-as-is", "server-parsed", "server-status", "Size", "standalone", "SymLinksIfOwnerMatch", "TRACE", "type-map", "unformatted", "UNLOCK", "valid-user", "warn"},
  },

  { Id=1,
    Regex=[[<!?\/?\w+>?|/?>]],
  },
  { Id=2,
    Regex=[[([-\w]+)="]],
  },
  { Id=3,
    Regex=[[\&\#?\w+;]],
  },
}

Strings={
  Delimiter=[["|']],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[#]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|\!|\=|\/|\*|\%|\+|\-]]