Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
mg

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"<span class=\"historyDash\">-<\/span>\s*((?:[^\<]|\n)*?)\s*<\/div>" test_str = ("\n" "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n" "<html>\n" "<head>\n" "<title>Steam Community :: TripleThreat :: Persona name history</title>\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/shared/css/motiva_sans.css?v=F3z3QpekjE2f\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/shared/css/buttons.css?v=LNGz0aQrH--g\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/shared/css/shared_global.css?v=DOYfTk4evOTc\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/css/globalv2.css?v=RLlF4NbPEL4H\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/css/skin_1/global.css?v=gY3Z5G6712K3&amp;client=0\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/css/skin_1/group_history.css?v=8TYZeQAleI4j\" rel=\"stylesheet\" type=\"text/css\" >\n" "<link href=\"http://steamcommunity-a.akamaihd.net/public/css/skin_1/header.css?v=z3WBKGTLlnCN\" rel=\"stylesheet\" type=\"text/css\" >\n" " <script>\n" " (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){\n" " (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),\n" " m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)\n" " })(window,document,'script','//www.google-analytics.com/analytics.js','ga');\n\n" " ga('create', 'UA-33779068-1', 'auto', {\n" " 'sampleRate': 0.4 });\n" " ga('set', 'dimension1', false );\n" " ga('set', 'dimension2', 'External' );\n" " ga('set', 'dimension3', 'profiles' );\n" " ga('set', 'dimension4', \"profiles\\/namehistory\" );\n" " ga('send', 'pageview');\n\n" " </script>\n" " <script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/javascript/prototype-1.7.js?v=.55t44gwuwgvw\"></script>\n" "<script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/javascript/scriptaculous/_combined.js?v=9XVsa_Ni33oN&amp;l=english&amp;load=effects,controls,slider,dragdrop\"></script>\n" "<script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/javascript/global.js?v=VblJ8Wqm5w5i&amp;l=english\"></script>\n" "<script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/javascript/jquery-1.11.1.min.js?v=.isFTSRckeNhC\"></script>\n" "<script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/shared/javascript/tooltip.js?v=._0UFXFGgvme-\"></script>\n" "<script type=\"text/javascript\" src=\"http://steamcommunity-a.akamaihd.net/public/shared/javascript/shared_global.js?v=pU8RP8XZB6Hb&amp;l=english\"></script>\n" "<script type=\"text/javascript\">$J = jQuery.noConflict();\n" "if ( typeof JSON != 'object' || !JSON.stringify || !JSON.parse ) { document.write( \"<scr\" + \"ipt type=\\\"text\\/javascript\\\" src=\\\"http:\\/\\/steamcommunity-a.akamaihd.net\\/public\\/javascript\\/json2.js?v=pmScf4470EZP&amp;l=english\\\"><\\/script>\\n\" ); };\n" "</script></head>\n" "<body>\n" "<center>\n" "<!-- header bar, contains info browsing user if logged in -->\n" "<div id=\"global_header\">\n" " <div class=\"content\">\n\n" " <div class=\"logo\">\n" " <span id=\"logo_holder\">\n" " <a href=\"http://store.steampowered.com/\">\n" " <img src=\"http://steamcommunity-a.akamaihd.net/public/shared/images/header/globalheader_logo.png\" width=\"176\" height=\"44\">\n" " </a>\n" " </span>\n" " <!--[if lt IE 7]>\n" " <style type=\"text/css\">\n" " #logo_holder img { filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0); }\n" " #logo_holder { display: inline-block; width: 176px; height: 44px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://steamcommunity-a.akamaihd.net/public/images/v5/globalheader_logo.png'); }\n" " </style>\n" " <![endif]-->\n" " </div>\n\n" " <div class=\"supernav_container\">\n" " <a class=\"menuitem supernav\" href=\"http://store.steampowered.com/\" data-tooltip-type=\"selector\" data-tooltip-content=\".submenu_store\">\n" " STORE </a>\n" " <div class=\"submenu_store\" style=\"display: none;\" data-submenuid=\"store\">\n" " <a class=\"submenuitem\" href=\"http://store.steampowered.com/\">Featured</a>\n" " <a class=\"submenuitem\" href=\"http://store.steampowered.com/explore/\">Explore</a>\n" " <a class=\"submenuitem\" href=\"http://store.steampowered.com/curators/\">Curators</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/my/wishlist/\">Wishlist</a>\n" " <a class=\"submenuitem\" href=\"http://store.steampowered.com/news/\">News</a>\n" " <a class=\"submenuitem\" href=\"http://store.steampowered.com/stats/\">Stats</a>\n" " </div>\n\n\n" " <a class=\"menuitem supernav\" style=\"display: block\" href=\"http://steamcommunity.com/\" data-tooltip-type=\"selector\" data-tooltip-content=\".submenu_community\">\n" " COMMUNITY </a>\n" " <div class=\"submenu_community\" style=\"display: none;\" data-submenuid=\"community\">\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/\">Home</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/discussions/\">Discussions</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/workshop/\">Workshop</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/greenlight/\">Greenlight</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/market/\">Market</a>\n" " <a class=\"submenuitem\" href=\"http://steamcommunity.com/?subsection=broadcasts\">Broadcasts</a>\n" " </div>\n\n" " \n\n" " \n" " <a class=\"menuitem\" href=\"http://store.steampowered.com/about/\">\n" " ABOUT </a>\n" " \n" " <a class=\"menuitem\" href=\"https://help.steampowered.com/en/\">\n" " SUPPORT </a>\n" " </div>\n" " <script type=\"text/javascript\">\n" " jQuery(function($) {\n" " $('.tooltip').v_tooltip();\n" " $('#global_header .supernav').v_tooltip({'location':'bottom', 'tooltipClass': 'supernav_content', 'offsetY':-4, 'offsetX': 1, 'horizontalSnap': 4, 'tooltipParent': '#global_header .supernav_container', 'correctForScreenSize': false});\n" " });\n" " </script>\n\n" " <div id=\"global_actions\">\n" " <div id=\"global_action_menu\">\n" " <div class=\"header_installsteam_btn header_installsteam_btn_green\">\n" " <div class=\"header_installsteam_btn_leftcap\"></div>\n" " <div class=\"header_installsteam_btn_rightcap\"></div>\n" " <a class=\"header_installsteam_btn_content\" href=\"http://store.steampowered.com/about/\">\n" " Install Steam </a>\n" " </div>\n\n" " \n" " <a class=\"global_action_link\" href=\"https://steamcommunity.com/login/home/?goto=id%2FTripleThreat%2Fnamehistory\">login</a>\n" " &nbsp;|&nbsp;\n" " <span class=\"pulldown global_action_link\" id=\"language_pulldown\" onclick=\"ShowMenu( this, 'language_dropdown', 'right' );\">language</span>\n" " <div class=\"popup_block_new\" id=\"language_dropdown\" style=\"display: none;\">\n" " <div class=\"popup_body popup_menu\">\n" " <a class=\"popup_menu_item tight\" href=\"?l=bulgarian\" onclick=\"ChangeLanguage( 'bulgarian' ); return false;\">Български (Bulgarian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=czech\" onclick=\"ChangeLanguage( 'czech' ); return false;\">čeština (Czech)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=danish\" onclick=\"ChangeLanguage( 'danish' ); return false;\">Dansk (Danish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=dutch\" onclick=\"ChangeLanguage( 'dutch' ); return false;\">Nederlands (Dutch)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=finnish\" onclick=\"ChangeLanguage( 'finnish' ); return false;\">Suomi (Finnish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=french\" onclick=\"ChangeLanguage( 'french' ); return false;\">Français (French)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=german\" onclick=\"ChangeLanguage( 'german' ); return false;\">Deutsch (German)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=greek\" onclick=\"ChangeLanguage( 'greek' ); return false;\">Ελληνικά (Greek)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=hungarian\" onclick=\"ChangeLanguage( 'hungarian' ); return false;\">Magyar (Hungarian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=italian\" onclick=\"ChangeLanguage( 'italian' ); return false;\">Italiano (Italian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=japanese\" onclick=\"ChangeLanguage( 'japanese' ); return false;\">日本語 (Japanese)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=koreana\" onclick=\"ChangeLanguage( 'koreana' ); return false;\">한국어 (Korean)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=norwegian\" onclick=\"ChangeLanguage( 'norwegian' ); return false;\">Norsk (Norwegian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=polish\" onclick=\"ChangeLanguage( 'polish' ); return false;\">Polski (Polish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=portuguese\" onclick=\"ChangeLanguage( 'portuguese' ); return false;\">Português (Portuguese)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=brazilian\" onclick=\"ChangeLanguage( 'brazilian' ); return false;\">Português-Brasil (Portuguese-Brazil)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=romanian\" onclick=\"ChangeLanguage( 'romanian' ); return false;\">Română (Romanian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=russian\" onclick=\"ChangeLanguage( 'russian' ); return false;\">Русский (Russian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=schinese\" onclick=\"ChangeLanguage( 'schinese' ); return false;\">简体中文 (Simplified Chinese)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=spanish\" onclick=\"ChangeLanguage( 'spanish' ); return false;\">Español (Spanish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=swedish\" onclick=\"ChangeLanguage( 'swedish' ); return false;\">Svenska (Swedish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=tchinese\" onclick=\"ChangeLanguage( 'tchinese' ); return false;\">繁體中文 (Traditional Chinese)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=thai\" onclick=\"ChangeLanguage( 'thai' ); return false;\">ไทย (Thai)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=turkish\" onclick=\"ChangeLanguage( 'turkish' ); return false;\">Türkçe (Turkish)</a>\n" " <a class=\"popup_menu_item tight\" href=\"?l=ukrainian\" onclick=\"ChangeLanguage( 'ukrainian' ); return false;\">Українська (Ukrainian)</a>\n" " <a class=\"popup_menu_item tight\" href=\"http://translation.steampowered.com\" target=\"_blank\">Help us translate Steam</a>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" "</div>\n" "<div id=\"modalBG\" style=\"display: none\"></div><script type=\"text/javascript\">\n" " g_sessionID = \"64b42b79f53030fe530e09fa\";\n" " g_steamID = false;\n\n" " // We always want to have the timezone cookie set for PHP to use\n" " setTimezoneCookies();\n\n" " $J( function() {\n\n" " InitMiniprofileHovers();\n" " InitEmoticonHovers();\n" " window.BindCommunityTooltip = function( $Selector ) { $Selector.v_tooltip( {'tooltipClass': 'community_tooltip', 'dataName': 'communityTooltip' } ); };\n" " BindCommunityTooltip( $J('[data-community-tooltip]') );\n" " });\n\n" " $J( function() { InitEconomyHovers( \"http:\\/\\/steamcommunity-a.akamaihd.net\\/public\\/css\\/skin_1\\/economy.css?v=k1KbRUnfe-Sy\", \"http:\\/\\/steamcommunity-a.akamaihd.net\\/public\\/javascript\\/economy_common.js?v=tsXdRVB0yEaR&l=english\", \"http:\\/\\/steamcommunity-a.akamaihd.net\\/public\\/javascript\\/economy.js?v=KgoJ8nBUSyBe&l=english\" );});</script><!-- /header bar -->\n" "<div id=\"mainBody\">\n" "<!-- main contents -->\n" " <div id=\"mainContents\">\n" " <!-- top content -->\n" " <div id=\"topGroupAvatar\">\n" " <div class=\"mediumHolder_default\"><div class=\"avatarMedium\"><a href=\"http://steamcommunity.com/id/TripleThreat\"><img src=\"http://cdn.akamai.steamstatic.com/steamcommunity/public/images/avatars/80/809c91ef963bce53195c205066f91babc729e647_medium.jpg\" /></a></div></div>\n" " </div>\n" " <h2>Persona name history</h2>\n" " <h1><a id=\"topNameLink\" href=\"http://steamcommunity.com/id/TripleThreat\">TripleThreat</a></h1>\n" " <!-- /top content -->\n" " <!-- main body -->\n" " <br />\n\n" " <div class=\"historyItem\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 12:15pm</span>\n" " <span class=\"historyDash\">-</span>\n" " TripleThreat </div>\n" " <div class=\"historyItemb\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 9:21am</span>\n" " <span class=\"historyDash\">-</span>\n" " [FD] TripleThreat.blyat </div>\n" " <div class=\"historyItem\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 8:45am</span>\n" " <span class=\"historyDash\">-</span>\n" " 9 </div>\n" " <div class=\"historyItemb\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 8:45am</span>\n" " <span class=\"historyDash\">-</span>\n" " 7 </div>\n" " <div class=\"historyItem\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 8:45am</span>\n" " <span class=\"historyDash\">-</span>\n" " 5 </div>\n" " <div class=\"historyItemb\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 8:45am</span>\n" " <span class=\"historyDash\">-</span>\n" " 3 </div>\n" " <div class=\"historyItem\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 23 @ 8:45am</span>\n" " <span class=\"historyDash\">-</span>\n" " 1 </div>\n" " <div class=\"historyItemb\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 22 @ 6:10pm</span>\n" " <span class=\"historyDash\">-</span>\n" " This is a test </div>\n" " <div class=\"historyItem\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jul 14 @ 5:28pm</span>\n" " <span class=\"historyDash\">-</span>\n" " [FD] TripleThreat </div>\n" " <div class=\"historyItemb\">\n" " <div class=\"historyIcon\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/HistoryNameChange.gif\" width=\"13\" height=\"12\" border=\"0\" /></div>\n" " <span class=\"historyShort\">Name Changed</span>\n" " <span class=\"historyDash\">-</span>\n" " <span class=\"historyDate\">Jun 30 @ 5:44pm</span>\n" " <span class=\"historyDash\">-</span>\n" " admin </div>\n" " <br clear=\"all\" />\n" " </div>\n" "<br clear=\"all\" />\n" "</div>\n" "<!-- footer -->\n" " <div id=\"footer_spacer\"></div>\n" " <div id=\"footer_responsive_optin_spacer\"></div>\n" " <div id=\"footer\">\n" " <div class=\"footer_content\">\n" " <span id=\"footerLogo\"><img src=\"http://steamcommunity-a.akamaihd.net/public/images/skin_1/footerLogo_valve.png?v=1\" width=\"96\" height=\"26\" border=\"0\" alt=\"Valve Logo\" /></span>\n" " <span id=\"footerText\">\n" " &copy; Valve Corporation. All rights reserved. All trademarks are property of their respective owners in the US and other countries.<br/>Some geospatial data on this website is provided by <a href=\"https://steamcommunity.com/linkfilter/?url=http://www.geonames.org\" target=\"_blank\" rel=\"noreferrer\">geonames.org</a>. <br>\n" " <span class=\"valve_links\">\n" " <a href=\"http://store.steampowered.com/privacy_agreement/\" target=\"_blank\">Privacy Policy</a>\n" " &nbsp; | &nbsp;<a href=\"http://www.valvesoftware.com/legal.htm\" target=\"_blank\">Legal</a>\n" " &nbsp;| &nbsp;<a href=\"http://store.steampowered.com/subscriber_agreement/\" target=\"_blank\">Steam Subscriber Agreement</a>\n" " </span>\n" " </span>\n" " </div>\n" " <div class=\"responsive_optin_link\">\n" " <div class=\"btn_medium btnv6_grey_black\" onclick=\"Responsive_RequestMobileView()\">\n" " <span>View mobile website</span>\n" " </div>\n" " </div>\n" " </div>\n" " ") matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html