Regular Expressions 101

Save & Share

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

/
/
gim

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression. sed -E 's/<a href="https:.*(\\/)([^\\/]+)(?:(?=\\/"))\\//<a href="\2.html/gim;t' <<< "<li id=\"menu-item-1755\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1755\"><a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/secrets-of-print-on-demand/\" itemprop=\"url\" class=\"wpc-lesson wpc-lesson-1754 wpc-lesson-complete\">BONUS VIDEO! The Secrets Of 6-Figure &amp; 7-Figure Print On Demand Products</a></li> <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/dashboard/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-1/introduction/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-1/phase-1-brainstorming-a-niche/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-1/phase-2-narrow-down-your-niches/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-1/phase-3-picking-your-winning-niche/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-1/how-to-select-a-store-name/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-pick-aliexpress-products-to-sell/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-select-the-right-aliexpress-supplier/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-find-print-on-demand-designs-to-sell-2/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-get-a-design-on-fiverr/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/create-free-designs/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-get-a-design-on-shutterstock/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/how-to-price-products/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-2/secrets-of-print-on-demand/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-a-shopify-account/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-install-the-theme/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-install-oberlo-update-its-settings/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-install-the-chrome-extension/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-add-products-with-oberlo/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-a-printify-account/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-a-product-with-printify/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-update-product-pages/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-add-collections/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-an-about-us-page/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-an-contact-us/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-a-refund-policy-page/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-set-up-payments/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/add-legal-pages/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-add-menus/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-3/how-to-create-a-logo/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-customize-theme-homepage/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-add-shipping-2/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-edit-confirmation-email-2/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-add-facebook-live-chat/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-buy-a-domain-name-2/\" <a href=\"https://members.theecommclubhouse.com/step-3/how-to-remove-store-password-2/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-4/how-to-add-sales-pop/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-4/how-to-add-trust-icons/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-4/how-to-add-smar7-bundle-upsell/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-4/how-to-add-spin-a-wheel-app/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-4/how-to-add-after-sale-coupons/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/introduction-to-facebook/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-a-facebook-business-account/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-a-facebook-fanpage/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-install-the-facebook-pixel/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/lifestyle-images-print-on-demand/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-a-showcase-video-ad/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-edit-a-showcase-video-ad/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-an-example-video-ad/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-an-image-ad/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-create-a-facebook-video-ad-2/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-scale-facebook-ads/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-get-free-seo-traffic-from-google/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-find-low-competition-keywords/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-optimize-product-pages/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-optimize-product-category-pages/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-optimize-your-homepage/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-add-optimize-blog-posts/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-5/how-to-build-backlinks-with-instagram-pages/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-6/how-to-fulfill-orders-with-oberlo/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-6/how-to-fulfill-orders-with-printify/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-6/daily-store-management-growth/\" <a href=\"https://members.theecommclubhouse.com/ecomm-clubhouse/step-6/how-to-hire-freelancers/\" "

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 SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html