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
Processing...

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#"(?m)(?<=\"stars\"\:)\d+"#).unwrap(); let string = "<script type=\"application/json\" data-initial-state=\"review-info\"> {\"socialShareUrl\":\"https://fr.trustpilot.com/reviews/5e064162c845450914acd7d8\",\"businessUnitId\":\"5a79a6af2a14f20001dce8d9\",\"businessUnitDisplayName\":\"Qonto\",\"consumerId\":\"58e77f560000ff000a8aaf52\",\"consumerName\":\"Web Biz\",\"reviewId\":\"5e064162c845450914acd7d8\",\"stars\":5} </script> <aside class=\"review__consumer-information\"> <a href=\"/users/58e77f560000ff000a8aaf52\" class=\"consumer-information\" data-track-link=\"{'target': 'Consumer profile', 'name': 'consumer-info'}\"> <div class=\"consumer-information__picture\"><div><img alt=\"Web Biz\" src=\"https://user-images.trustpilot.com/58e77f560000ff000a8aaf52/73x73.png\" class=\"consumer-information__picture\"></div></div> <div class=\"consumer-information__details\"> <div class=\"consumer-information__name\" v-pre=\"\"> Web Biz </div> <div class=\"consumer-information__data\"> <div class=\"consumer-information__review-count\"> <svg class=\"consumer-information__review-icon\"><use xlink:href=\"#icon_pencil\"></use></svg> <span class=\"\">2 avis</span> </div> </div> </div> </a> </aside> <section class=\"review__content\"> <div class=\"review-content\"> <div class=\"review-content__header\" v-pre=\"\"> <div class=\"review-content-header\"> <div class=\"star-rating star-rating--medium\"> <img src=\"//cdn.trustpilot.net/brand-assets/4.1.0/stars/stars-5.svg\" alt=\"5 étoiles : excellent\" class=\"\"> </div> <div class=\"review-content-header__dates\"> <script type=\"application/json\" data-initial-state=\"review-dates\"> {\"publishedDate\":\"2019-12-27T17:37:38Z\",\"updatedDate\":null,\"reportedDate\":null} </script> <div class=\"v-popover\"><span aria-describedby=\"popover_39ayy7ms4m\" class=\"trigger\" style=\"display: inline-block;\"><time datetime=\"2019-12-27T17:37:38.000Z\" title=\"vendredi 27 décembre 2019 à 18:37:38\" class=\"review-date--tooltip-target\">Il y a un jour</time> <div class=\"tooltip-container-1\"></div> <!----></span> </div> </div> <div class=\"review-content-header__review-verified\"> <script type=\"application/json\" data-initial-state=\"review-verified\"> {\"businessUnitDisplayName\":\"Qonto\",\"consumerName\":\"Web Biz\",\"informationRequestStatus\":\"none\",\"isVerified\":true,\"verificationSource\":\"invitation\"} </script> <div class=\"review-verified\"><div class=\"v-popover\"><span aria-describedby=\"popover_2qraarad2d\" class=\"trigger\" style=\"display: inline-block;\"><div class=\"review-verified-tooltip-trigger\"><svg class=\"icon review-verified__icon\"><use xlink:href=\"#claimed_16\"></use></svg> Commande vérifiée </div> </span> </div></div> </div> </div> </div> <div class=\"review-content__body\" v-pre=\"\"> <h2 class=\"review-content__title\"> <a class=\"link link--large link--dark\" href=\"/reviews/5e064162c845450914acd7d8\" data-track-link=\"{'target': 'Single review', 'name': 'review-title'}\">Une néo-banque à la page</a> </h2> <p class=\"review-content__text\"> J'utilise mon compte pro depuis un logiciel via les API et j'en suis content. </p> </div> </div> </section> <div class=\"review__actions\"> <div class=\"review-actions\"> <div class=\"review-actions__main\"> <div class=\"review-action brand-find-useful\"><div class=\"v-popover\"><span aria-describedby=\"popover_fduf3oid65\" class=\"trigger\" style=\"display: inline-block;\"><div><button role=\"button\" tabindex=\"0\" class=\"button button--subtle button--subtle-label-below brand-find-useful__button\"><svg class=\"icon icon-thumbs-up\"><use xlink:href=\"#icon_thumbs-up\"></use></svg> <span>Utile</span> <!----></button> <div></div></div> <!----></span> </div></div> <div class=\"brand-share-button-wrapper\"><div class=\"v-popover\"><span aria-describedby=\"popover_8265ojkqp0\" class=\"trigger\" style=\"display: inline-block;\"><div><button class=\"button button--subtle brand-share-button\"><svg class=\"icon icon-share\"><use xlink:href=\"#icon_share\"></use></svg> <span class=\"\">Partager</span></button> <div id=\"share-button-tooltip-container-1\"></div></div> </span> </div></div> <a href=\"https://businessapp.b2b.trustpilot.com/#/reviews/5e064162c845450914acd7d8\" rel=\"nofollow\" target=\"_blank\" class=\"button button--subtle button--subtle-label-below\" title=\"Réponse\" style=\"display: none\" data-track-link=\"{ 'name': 'reply-as-company', 'target': 'Business App', 'legacyName': 'ReplyAsCompany' }\" data-reply-as-company-button=\"\"> <svg class=\"icon\"> <use xlink:href=\"#icon_reply\"></use> </svg> <span>Répondre</span> </a> </div> <div class=\"review-actions__notify-wrapper\"> <button type=\"button\" class=\"button button--subtle button--subtle-label-below\" data-track-button=\"{ 'name': 'notify-compliance', 'legacyName': 'ReportNotification Click' }\"><svg class=\"icon icon-flag--outline\"><use xlink:href=\"#icon_flag_outline\"></use></svg></button> </div> </div> </div> <div class=\"reporting\"></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/