Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
gu

Test String

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r#"(?u)<a aria-describedby=(?s).+?data-control-name="topcard_headquarters"\h+href="(?-s)(.+?)\h+rel="#).unwrap(); let string = "<div class=\"top-card\"> <div id=\"ember862\" class=\"entity-card nav company ember-view\"> <div class=\"nav-container\"> <div id=\"ember863\" class=\"avatar inline-table ember-view\"><img src=\"https://media.licdn.com/dms/image/C560BAQHXIWxrkUKdKg/company-logo_100_100/0?e=1579737600&amp;v=beta&amp;t=UBw6s13aoyScxYiCc41zzf6-xr0TNukCph8sSDpuEOE\" class=\"entity-image entity-size-2 company \" alt=\"Cutter &amp;amp; Buck’s logo\"> </div> <div class=\"content-container\"> <h1 id=\"ember864\" class=\"flex align-items-center title ember-view\"> Cutter &amp; Buck </h1> </div> <div class=\"right actions-container\"> <artdeco-dropdown id=\"ember866\" class=\"save-to-list-dropdown ember-view\"><artdeco-dropdown-trigger aria-expanded=\"false\" role=\"button\" placement=\"bottom\" id=\"ember867\" class=\"save-to-list-dropdown__trigger button-secondary-small m-type--message ember-view\" tabindex=\"0\"> Save <!----></artdeco-dropdown-trigger><artdeco-dropdown-content arrow-dir=\"right\" justification=\"left\" placement=\"bottom\" data-dropdown=\"\" tabindex=\"-1\" aria-hidden=\"true\" id=\"ember868\" class=\"save-to-list-dropdown__content-container artdeco-dropdown-with-arrow ember-view\"> <!----> </artdeco-dropdown-content></artdeco-dropdown> </div> </div> </div> <div class=\"entity-card company banner\"> <div id=\"ember869\" class=\"avatar ember-view\"><img src=\"https://media.licdn.com/dms/image/C560BAQHXIWxrkUKdKg/company-logo_100_100/0?e=1579737600&amp;v=beta&amp;t=UBw6s13aoyScxYiCc41zzf6-xr0TNukCph8sSDpuEOE\" class=\"entity-image entity-size-6 company \" alt=\"Cutter &amp;amp; Buck’s logo\"> </div> <div class=\"content-container\"> <div class=\"flex align-items-center mb1\"> <h1 class=\"title inline-block\"> Cutter &amp; Buck </h1> <!----> </div> <div class=\"modal-description-wrapper\"> <h2 class=\"subtitle\" role=\"link\" data-control-name=\"topcard_companyDescription\"> <div id=\"ember870\" class=\"ember-view\">Cutter &amp; Buck Inc. was found…<button class=\"button--unstyled link-without-visited-state inline-block font-size-inherit topcard-see-more-link\" type=\"button\">See all</button></div> </h2> </div> <p class=\"muted-copy Sans-14px-black-60%\"> Apparel &amp; Fashion · United States · 201-500 employees <!----> </p> <span class=\"cta-link\"> <span class=\"facepile-container\"> <img src=\"https://media.licdn.com/dms/image/C4D03AQHeGZtGLzfKuA/profile-displayphoto-shrink_800_800/0?e=1577318400&amp;v=beta&amp;t=WtB92LCoZaMWXLBjmAMGLg86s9U0_9j_brVtVK8PO58\" class=\"ghost-person circle-facepile\" alt=\"\"> <img src=\"https://media.licdn.com/dms/image/C4D03AQEhREY07Z_MHg/profile-displayphoto-shrink_800_800/0?e=1577318400&amp;v=beta&amp;t=2iZZguioIkpBzfsM29vbtGY_uBoqoEYEOekQR1JGDZE\" class=\"ghost-person circle-facepile\" alt=\"\"> <img src=\"https://media.licdn.com/dms/image/C5603AQE0mzb2-gU5Kw/profile-displayphoto-shrink_800_800/0?e=1577318400&amp;v=beta&amp;t=HRF5YwFFHSI1NjhU4-SbAWYtyT_9pGf9Zd6JLiGRiA8\" class=\"ghost-person circle-facepile\" alt=\"\"> <!----><!----><!----><!----><!----> </span> <a data-control-name=\"topcard_employees\" href=\"/sales/search/people/list/employees-for-account/14178\" id=\"ember879\" class=\"ember-view\"> 298 employees </a> <div class=\"mh2\">|</div> <a data-control-name=\"num_decision-makers\" href=\"/sales/search/people/list/employees-for-account/14178?seniority=6%2C7%2C8\" id=\"ember880\" class=\"ember-view\"> 30 decision makers </a> </span> <div class=\"mt4\"> <ul class=\"flex flex-wrap list-style-none\"> <!----> <li id=\"ember881\" class=\"inline-flex mt2 ml1 pb1 ember-view\"> <button class=\"topcard__add-button t-14 t-bold t-black--light button--unstyled\" data-control-name=\"topcard_addTag\"> <li-icon aria-hidden=\"true\" type=\"plus-icon\" class=\"vertical-align-text-bottom\" size=\"small\"><svg viewBox=\"0 0 24 24\" width=\"24px\" height=\"24px\" x=\"0\" y=\"0\" preserveAspectRatio=\"xMinYMin meet\" class=\"artdeco-icon\" focusable=\"false\"><path d=\"M14,9H9v5H7V9H2V7H7V2H9V7h5V9Z\" class=\"small-icon\" style=\"fill-opacity: 1\"></path></svg></li-icon> Add Tag </button> <!----> </li> </ul> <div id=\"ember882\" class=\"ember-view\"><!----></div> </div> </div> <div class=\"right actions-container mt1\"> <div class=\"company-topcard-actions flex align-items-center\"> <artdeco-dropdown id=\"ember884\" class=\"save-to-list-dropdown ember-view\"><artdeco-dropdown-trigger aria-expanded=\"false\" role=\"button\" placement=\"bottom\" id=\"ember885\" class=\"save-to-list-dropdown__trigger button-primary-large ember-view\" tabindex=\"0\"> Save <!----></artdeco-dropdown-trigger><artdeco-dropdown-content arrow-dir=\"right\" justification=\"left\" placement=\"bottom\" data-dropdown=\"\" tabindex=\"-1\" aria-hidden=\"true\" id=\"ember886\" class=\"save-to-list-dropdown__content-container artdeco-dropdown-with-arrow ember-view\"> <!----> </artdeco-dropdown-content></artdeco-dropdown> <artdeco-dropdown id=\"ember887\" class=\"ember-view\"><artdeco-dropdown-trigger aria-expanded=\"false\" role=\"button\" placement=\"bottom\" id=\"ember888\" class=\"button-round-tertiary-medium-muted block ml1 ember-view\" tabindex=\"0\"> <li-icon type=\"ellipsis-horizontal-icon\" role=\"img\" aria-label=\"More actions\"><svg viewBox=\"0 0 24 24\" width=\"24px\" height=\"24px\" x=\"0\" y=\"0\" preserveAspectRatio=\"xMinYMin meet\" class=\"artdeco-icon\" focusable=\"false\"><path d=\"M2,10H6v4H2V10Zm8,4h4V10H10v4Zm8-4v4h4V10H18Z\" class=\"large-icon\" style=\"fill: currentColor\"></path></svg></li-icon> <!----></artdeco-dropdown-trigger><artdeco-dropdown-content arrow-dir=\"right\" justification=\"right\" placement=\"bottom\" data-dropdown=\"\" tabindex=\"-1\" aria-hidden=\"true\" id=\"ember889\" class=\"company-topcard-actions__overflow-dropdown artdeco-dropdown-with-arrow ember-view\"><!----></artdeco-dropdown-content></artdeco-dropdown> </div> <div class=\"meta-links\"> <div class=\"topcard-hovercard-meta-links\"> <artdeco-hoverable-trigger tabindex=\"-1\" id=\"ember890\" class=\"ember-view\"> <a aria-describedby=\"artdeco-hoverable-artdeco-gen-63\" aria-label=\"Go to website (new window)\" class=\"inverse-link-on-a-light-background link-without-visited-state meta-link\" data-control-name=\"topcard_website\" href=\"http://www.cutterbuck.com\" rel=\"noopener noreferrer\" target=\"_blank\"> <li-icon aria-hidden=\"true\" type=\"link-icon\" size=\"small\"><svg viewBox=\"0 0 24 24\" width=\"24px\" height=\"24px\" x=\"0\" y=\"0\" preserveAspectRatio=\"xMinYMin meet\" class=\"artdeco-icon\" focusable=\"false\"><path d=\"M11,2a3,3,0,0,0-2.1.87L6.87,4.94a2.93,2.93,0,0,0-.72,1.21,2.93,2.93,0,0,0-1.21.72L2.87,8.94a3,3,0,1,0,4.19,4.19l2.07-2.07a2.93,2.93,0,0,0,.72-1.21,2.93,2.93,0,0,0,1.21-.72l2.07-2.07A3,3,0,0,0,11,2ZM5.83,11.89a1.22,1.22,0,0,1-1.72-1.72L6.17,8.11l0,0A3,3,0,0,0,7.91,9.8l0,0Zm6.07-6.07L9.83,7.89l0,0A3,3,0,0,0,8.09,6.2l0,0,2.07-2.07A1.22,1.22,0,0,1,11.89,5.83Z\" class=\"small-icon\" style=\"fill-opacity: 1\"></path></svg></li-icon>Website </a> <div id=\"artdeco-gen-63\" class=\"ember-view\" style=\"display: none;\"><div id=\"ember892\" class=\"ember-view\"></div></div></artdeco-hoverable-trigger> </div> <div class=\"topcard-hovercard-meta-links\"> <artdeco-hoverable-trigger tabindex=\"-1\" id=\"ember893\" class=\"ember-view\"> <a aria-describedby=\"artdeco-hoverable-artdeco-gen-64\" aria-label=\"Go to address (new window)\" class=\"inverse-link-on-a-light-background link-without-visited-state meta-link\" data-control-name=\"topcard_headquarters\" href=\"https://www.google.com/maps/place/101+Elliott+AVE+W+Suite+100+Seattle+WA+98119+United+States\" rel=\"noopener noreferrer\" target=\"_blank\"> <li-icon aria-hidden=\"true\" type=\"map-marker-icon\" size=\"small\"><svg viewBox=\"0 0 24 24\" width=\"24px\" height=\"24px\" x=\"0\" y=\"0\" preserveAspectRatio=\"xMinYMin meet\" class=\"artdeco-icon\" focusable=\"false\"><path d=\"M8,4a2,2,0,1,0,2,2A2,2,0,0,0,8,4ZM8,7.13A1.13,1.13,0,1,1,9.13,6,1.13,1.13,0,0,1,8,7.13ZM8,1A5,5,0,0,0,3,6a5.37,5.37,0,0,0,.41,2S5.91,13,7.22,15.52A0.86,0.86,0,0,0,8,16H8a0.86,0.86,0,0,0,.78-0.48C10.09,13,12.59,8,12.59,8A5.37,5.37,0,0,0,13,6,5,5,0,0,0,8,1Zm2.88,6.24L8,12.92,5.12,7.24A3.49,3.49,0,0,1,4.88,6a3.13,3.13,0,0,1,6.25,0A3.49,3.49,0,0,1,10.88,7.24Z\" class=\"small-icon\" style=\"fill-opacity: 1\"></path></svg></li-icon>Headquarters </a> <div id=\"artdeco-gen-64\" class=\"ember-view\" style=\"display: none;\"><div id=\"ember895\" class=\"ember-view\"></div></div></artdeco-hoverable-trigger> </div> </div> <button class=\"add-note topcard__add-button t-14 t-bold t-black--light\" data-control-name=\"topcard_addNote\" data-ember-action=\"\" data-ember-action-896=\"896\"> <li-icon aria-hidden=\"true\" type=\"sticky-note-icon\" size=\"small\"><svg viewBox=\"0 0 24 24\" width=\"24px\" height=\"24px\" x=\"0\" y=\"0\" preserveAspectRatio=\"xMinYMin meet\" class=\"artdeco-icon\" focusable=\"false\"><path d=\"M2,3V13a1,1,0,0,0,1,1h7.13L14,10.1V3a1,1,0,0,0-1-1H3A1,1,0,0,0,2,3ZM4,4h8V9H9v3H4V4Z\" class=\"small-icon\" style=\"fill-opacity: 1\"></path></svg></li-icon> Add Note </button> <!----> </div> </div> </div>"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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 Rust, please visit: https://docs.rs/regex/latest/regex/