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<!doctypehtml><html class="sidebar-visible no-js light"lang=en><head><meta charset=UTF-8><title>Cover - Understanding Python re(gex)?</title><meta content="text/html; charset=utf-8"http-equiv=Content-Type><meta content="Example based guide to mastering Python regular expressions"name=description><meta content=width=device-width,initial-scale=1 name=viewport><meta content=#ffffff name=theme-color><meta content="Understanding Python re(gex)?"property=og:title><meta content=website property=og:type><meta content="Example based guide to mastering Python regular expressions"property=og:description><meta content=https://learnbyexample.github.io/py_regular_expressions/ property=og:url><meta content=https://raw.githubusercontent.com/learnbyexample/py_regular_expressions/master/images/py_regex_ls.png property=og:image><meta content=1280 property=og:image:width><meta content=720 property=og:image:height><meta content=summary_large_image property=twitter:card><meta content=@learn_byexample property=twitter:site><link href=favicon.svg rel=icon><link rel="shortcut icon"href=favicon.png><link href=css/variables.css rel=stylesheet><link href=css/general.css rel=stylesheet><link href=css/chrome.css rel=stylesheet><link href=FontAwesome/css/font-awesome.css rel=stylesheet><link href=fonts/fonts.css rel=stylesheet><link href=highlight.css rel=stylesheet><link href=tomorrow-night.css rel=stylesheet><link href=ayu-highlight.css rel=stylesheet><link href=style.css rel=stylesheet><body><script>var path_to_root = "";
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html.classList.add("sidebar-" + sidebar);</script><nav aria-label="Table of contents"class=sidebar id=sidebar><div class=sidebar-scrollbox><ol class=chapter><li class="chapter-item expanded affix"><a class=active href=cover.html>Cover</a><li class="chapter-item expanded affix"><a href=buy.html>Buy PDF/EPUB versions</a><li class="chapter-item expanded"><a href=preface.html><strong aria-hidden=true>1.</strong> Preface</a><li class="chapter-item expanded"><a href=why-is-it-needed.html><strong aria-hidden=true>2.</strong> Why is it needed?</a><li class="chapter-item expanded"><a href=re-introduction.html><strong aria-hidden=true>3.</strong> re introduction</a><li class="chapter-item expanded"><a href=anchors.html><strong aria-hidden=true>4.</strong> Anchors</a><li class="chapter-item expanded"><a href=alternation-and-grouping.html><strong aria-hidden=true>5.</strong> Alternation and Grouping</a><li class="chapter-item expanded"><a href=escaping-metacharacters.html><strong aria-hidden=true>6.</strong> Escaping metacharacters</a><li class="chapter-item expanded"><a href=dot-metacharacter-and-quantifiers.html><strong aria-hidden=true>7.</strong> Dot metacharacter and Quantifiers</a><li class="chapter-item expanded"><a href=interlude-tools-for-debugging-and-visualization.html><strong aria-hidden=true>8.</strong> Interlude: Tools for debugging and visualization</a><li class="chapter-item expanded"><a href=working-with-matched-portions.html><strong aria-hidden=true>9.</strong> Working with matched portions</a><li class="chapter-item expanded"><a href=character-class.html><strong aria-hidden=true>10.</strong> Character class</a><li class="chapter-item expanded"><a href=groupings-and-backreferences.html><strong aria-hidden=true>11.</strong> Groupings and backreferences</a><li class="chapter-item expanded"><a href=interlude-common-tasks.html><strong aria-hidden=true>12.</strong> Interlude: Common tasks</a><li class="chapter-item expanded"><a href=lookarounds.html><strong aria-hidden=true>13.</strong> Lookarounds</a><li class="chapter-item expanded"><a href=flags.html><strong aria-hidden=true>14.</strong> Flags</a><li class="chapter-item expanded"><a href=unicode.html><strong aria-hidden=true>15.</strong> Unicode</a><li class="chapter-item expanded"><a href=regex-module.html><strong aria-hidden=true>16.</strong> regex module</a><li class="chapter-item expanded"><a href=gotchas.html><strong aria-hidden=true>17.</strong> Gotchas</a><li class="chapter-item expanded"><a href=further-reading.html><strong aria-hidden=true>18.</strong> Further Reading</a><li class="chapter-item expanded"><a href=Exercise_solutions.html><strong aria-hidden=true>19.</strong> Exercise Solutions</a></li><br><hr><li class="chapter-item expanded"><i class="fa fa-github"id=git-repository-button></i><a href=https://github.com/learnbyexample/py_regular_expressions> Source code</a><li class="chapter-item expanded"><i class="fa fa-home"id=home-button></i><a href=https://learnbyexample.github.io/> My Blog</a><li class="chapter-item expanded"><i class="fa fa-book"id=book-button></i><a href=https://learnbyexample.github.io/books/> My Books</a><li class="chapter-item expanded"><i class="fa fa-envelope"id=mail-button></i><a href=https://learnbyexample.gumroad.com/l/learnbyexample-weekly> learnbyexample weekly</a><li class="chapter-item expanded"><i class="fa fa-twitter"id=twitter-button></i><a href=https://twitter.com/learn_byexample> Twitter</a></ol></div><div class=sidebar-resize-handle id=sidebar-resize-handle></div></nav><div class=page-wrapper id=page-wrapper><div class=page><div id=menu-bar-hover-placeholder></div><div class="menu-bar sticky bordered"id=menu-bar><div class=left-buttons><button aria-label="Toggle Table of Contents"title="Toggle Table of Contents"aria-controls=sidebar class=icon-button id=sidebar-toggle type=button><i class="fa fa-bars"></i></button><button aria-label="Change theme"title="Change theme"aria-controls=theme-list aria-expanded=false aria-haspopup=true class=icon-button id=theme-toggle type=button><i class="fa fa-paint-brush"></i></button><ul aria-label=Themes class=theme-popup id=theme-list role=menu><li role=none><button class=theme id=light role=menuitem>Light (default)</button><li role=none><button class=theme id=rust role=menuitem>Rust</button><li role=none><button class=theme id=coal role=menuitem>Coal</button><li role=none><button class=theme id=navy role=menuitem>Navy</button><li role=none><button class=theme id=ayu role=menuitem>Ayu</button></ul><button aria-label="Toggle Searchbar"title="Search. 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