- </script><nav id=sidebar class=sidebar aria-label="Table of contents"><div class=sidebar-scrollbox><ol class=chapter><li class="chapter-item expanded affix"><a 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></ol></div><div id=sidebar-resize-handle class=sidebar-resize-handle></div></nav><div id=page-wrapper class=page-wrapper><div class=page><div id=menu-bar-hover-placeholder></div><div id=menu-bar class="menu-bar sticky bordered"><div class=left-buttons><button id=sidebar-toggle class=icon-button type=button title="Toggle Table of Contents"aria-label="Toggle Table of Contents"aria-controls=sidebar><i class="fa fa-bars"></i></button><button id=theme-toggle class=icon-button type=button title="Change theme"aria-label="Change theme"aria-haspopup=true aria-expanded=false aria-controls=theme-list><i class="fa fa-paint-brush"></i></button><ul id=theme-list class=theme-popup aria-label=Themes role=menu><li role=none><button role=menuitem class=theme id=light>Light (default)</button><li role=none><button role=menuitem class=theme id=rust>Rust</button><li role=none><button role=menuitem class=theme id=coal>Coal</button><li role=none><button role=menuitem class=theme id=navy>Navy</button><li role=none><button role=menuitem class=theme id=ayu>Ayu</button></ul><button id=search-toggle class=icon-button type=button title="Search. (Shortkey: s)"aria-label="Toggle Searchbar"aria-expanded=false aria-keyshortcuts=S aria-controls=searchbar><i class="fa fa-search"></i></button></div><h1 class=menu-title>Python re(gex)?</h1><div class=right-buttons><a href=https://github.com/learnbyexample/py_regular_expressions title="Git repository"aria-label="Git repository"> <i id=git-repository-button class="fa fa-github"></i> </a></div></div><div id=search-wrapper class=hidden><form id=searchbar-outer class=searchbar-outer><input type=search name=search id=searchbar name=searchbar placeholder="Search this book ..."aria-controls=searchresults-outer aria-describedby=searchresults-header></form><div id=searchresults-outer class="searchresults-outer hidden"><div id=searchresults-header class=searchresults-header></div><ul id=searchresults></ul></div></div><script> | 
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