Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "<div\\s[\\s\\S]*?\\\"detailBulletsWrapper_feature_div[\\s\\S]*?<div\\s[\\s\\S]*?detailBullets_feature_div[\\s\\S]*?<ul[\\s\\S]*?ASIN:[\\s\\S]*?<\\/span>\\s*<span>([\\s\\S]*?)<\\/span>"; final String string = "<div id=\"detailBulletsWrapper_feature_div\" data-feature-name=\"detailBullets\" data-template-name=\"detailBullets\" class=\"a-section a-spacing-none feature\" data-cel-widget=\"detailBulletsWrapper_feature_div\">\n" + " <div id=\"detailBullets_feature_div\">\n" + " \n" + " \n\n\n\n\n\n" + " <ul class=\"a-unordered-list a-nostyle a-vertical a-spacing-none\">\n" + " \n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " <span class=\"a-text-bold\">Product Dimensions:\n" + " </span>\n" + " <span>5 x 5 x 0.7 inches</span>\n" + " \n" + " </span></li>\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " <span class=\"a-text-bold\">Shipping Weight:\n" + " </span>\n" + " <span>12 ounces (<a href=\"https://www.amazon.com/gp/help/seller/shipping.html/ref=dp_pd_shipping?_encoding=UTF8&amp;seller=&amp;asin=B07F9GS3VY\">View shipping rates and policies</a>)</span>\n" + " \n" + " </span></li>\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " <span class=\"a-text-bold\">ASIN:\n" + " </span>\n" + " <span>B07F9GS3VY</span>\n" + " \n" + " </span></li>\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " </span></li>\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " <span class=\"a-text-bold\">Item model number:\n" + " </span>\n" + " <span>WXAGLHP2</span>\n" + " \n" + " </span></li>\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " \n" + " <span class=\"a-text-bold\">Date first listed on Amazon:\n" + " </span>\n" + " <span>September 11, 2013</span>\n" + " \n" + " </span></li>\n" + " \n" + " \n" + " \n" + " \n" + " </ul>\n\n\n" + " \n" + " </div>\n" + " \n" + " \n\n" + "<div id=\"dpx-amazon-sales-rank_feature_div\">\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n" + "<style type=\"text/css\">\n" + ".zg_hrsr_item {list-style : none};\n" + "</style>\n" + "<li id=\"SalesRank\" style=\"list-style : none\">\n" + "<b>Amazon Best Sellers Rank:</b> #36,542 in Clothing, Shoes &amp; Jewelry (<a href=\"https://www.amazon.com/gp/bestsellers/fashion/ref=pd_dp_ts_fashion_1\">See Top 100 in Clothing, Shoes &amp; Jewelry</a>) <style type=\"text/css\">.zg_hrsr { margin: 0; padding: 0; list-style-type: none; }.zg_hrsr_item { margin: 0 0 0 10px; }.zg_hrsr_rank { display: inline-block; width: 80px; text-align: right; }</style><ul class=\"zg_hrsr\"> <li class=\"zg_hrsr_item\"> <span class=\"zg_hrsr_rank\">#39</span> <span class=\"zg_hrsr_ladder\">in&nbsp;<a href=\"https://www.amazon.com/gp/bestsellers/fashion/ref=pd_zg_hrsr_fashion_1_1\">Clothing, Shoes &amp; Jewelry</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/7147440011/ref=pd_zg_hrsr_fashion_1_2\">Women</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/679337011/ref=pd_zg_hrsr_fashion_1_3\">Shoes</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/6127771011/ref=pd_zg_hrsr_fashion_1_4\">Athletic</a> &gt; <b><a href=\"https://www.amazon.com/gp/bestsellers/fashion/679351011/ref=pd_zg_hrsr_fashion_1_5_last\">Women's</a></b></span> </li> <li class=\"zg_hrsr_item\"> <span class=\"zg_hrsr_rank\">#129</span> <span class=\"zg_hrsr_ladder\">in&nbsp;<a href=\"https://www.amazon.com/gp/bestsellers/fashion/ref=pd_zg_hrsr_fashion_2_1\">Clothing, Shoes &amp; Jewelry</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/7147440011/ref=pd_zg_hrsr_fashion_2_2\">Women</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/679337011/ref=pd_zg_hrsr_fashion_2_3\">Shoes</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/6127771011/ref=pd_zg_hrsr_fashion_2_4\">Athletic</a> &gt; <b><a href=\"https://www.amazon.com/gp/bestsellers/fashion/679377011/ref=pd_zg_hrsr_fashion_2_5_last\">Walking</a></b></span> </li> <li class=\"zg_hrsr_item\"> <span class=\"zg_hrsr_rank\">#284</span> <span class=\"zg_hrsr_ladder\">in&nbsp;<a href=\"https://www.amazon.com/gp/bestsellers/fashion/ref=pd_zg_hrsr_fashion_3_1\">Clothing, Shoes &amp; Jewelry</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/7147440011/ref=pd_zg_hrsr_fashion_3_2\">Women</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/679337011/ref=pd_zg_hrsr_fashion_3_3\">Shoes</a> &gt; <a href=\"https://www.amazon.com/gp/bestsellers/fashion/6127771011/ref=pd_zg_hrsr_fashion_3_4\">Athletic</a> &gt; <b><a href=\"https://www.amazon.com/gp/bestsellers/fashion/679360011/ref=pd_zg_hrsr_fashion_3_5_last\">Women's</a></b></span> </li></ul>\n" + "</li>\n" + "</div>\n\n" + " \n" + " <ul class=\"a-unordered-list a-nostyle a-vertical a-spacing-none\">\n" + " \n" + " <li><span class=\"a-list-item\">\n" + " <span class=\"a-text-bold\">\n" + " Average Customer Review:\n" + " </span>\n" + " \n\n\n\n\n" + "<style type=\"text/css\">\n" + " /* \n" + " * Fix for UDP-1061. Average customer reviews has a small extra line on hover \n" + " * https://omni-grok.amazon.com/xref/src/appgroup/websiteTemplates/retail/SoftlinesDetailPageAssets/udp-intl-lock/src/legacy.css?indexName=WebsiteTemplates#40\n" + " */\n" + " .noUnderline a:hover { \n" + " text-decoration: none; \n" + " }\n" + "</style>\n\n\n\n" + " \n" + " \n" + " \n" + " \n" + " \n\n" + " \n\n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n\n" + " <div id=\"detailBullets_averageCustomerReviews\" class=\"a-spacing-none\" data-asin=\"B07F9GS3VY\" data-ref=\"dpx_acr_pop_\">\n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n\n\n\n\n\n\n\n\n\n\n" + " <span class=\"a-declarative\" data-action=\"acrStarsLink-click-metrics\" data-acrstarslink-click-metrics=\"{}\">\n" + " \n\n\n\n\n\n" + " <span id=\"acrPopover\" class=\"reviewCountTextLinkedHistogram noUnderline\" title=\"4.1 out of 5 stars\">\n" + " <span class=\"a-declarative\" data-action=\"a-popover\" data-a-popover=\"{&quot;max-width&quot;:&quot;700&quot;,&quot;closeButton&quot;:&quot;false&quot;,&quot;position&quot;:&quot;triggerBottom&quot;,&quot;url&quot;:&quot;/gp/customer-reviews/widgets/average-customer-review/popover/ref=dpx_acr_pop_?contextId=dpx&amp;asin=B07F9GS3VY&quot;}\">\n" + " <a href=\"javascript:void(0)\" class=\"a-popover-trigger a-declarative\">\n" + " \n\n" + "<i class=\"a-icon a-icon-star a-star-4\"><span class=\"a-icon-alt\">4.1 out of 5 stars</span></i>\n" + " \n" + " <i class=\"a-icon a-icon-popover\"></i></a>\n" + " </span>\n" + " <span class=\"a-letter-space\"></span>\n" + " </span>\n\n\n" + " </span>\n" + " <span class=\"a-letter-space\"></span>\n" + " \n" + " \n\n" + " \n\n" + " \n\n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " <span class=\"a-declarative\" data-action=\"acrLink-click-metrics\" data-acrlink-click-metrics=\"{}\">\n" + " <a id=\"acrCustomerReviewLink\" class=\"a-link-normal\" href=\"#customerReviews\">\n" + " <span id=\"acrCustomerReviewText\" class=\"a-size-base\">221 customer reviews</span>\n" + " </a>\n" + " </span>\n" + " \n" + " <script type=\"text/javascript\">\n" + " P.when('A', 'ready').execute(function(A) {\n" + " A.declarative('acrLink-click-metrics', 'click', { \"allowLinkDefault\" : true }, function(event){\n" + " if(window.ue) {\n" + " ue.count(\"acrLinkClickCount\", (ue.count(\"acrLinkClickCount\") || 0) + 1);\n" + " }\n" + " });\n" + " });\n" + " </script>\n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " <script type=\"text/javascript\">\n" + " P.when('A', 'cf').execute(function(A) {\n" + " A.declarative('acrStarsLink-click-metrics', 'click', { \"allowLinkDefault\" : true }, function(event){\n" + " if(window.ue) {\n" + " ue.count(\"acrStarsLinkWithPopoverClickCount\", (ue.count(\"acrStarsLinkWithPopoverClickCount\") || 0) + 1);\n" + " }\n" + " });\n" + " });\n" + " </script>\n\n\n" + " \n" + " \n" + " </div>\n" + " \n\n\n" + " </span></li>\n" + " \n" + " </ul>\n" + " <div class=\"a-row\">\n" + " \n" + " \n\n\n\n\n" + " \n" + " </div>\n" + " <div class=\"a-row\">\n" + " \n" + " \n\n\n\n\n\n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " If you are a seller for this product, would you like to <b><a href=\"https://sellercentral.amazon.com/cu/contact-us?categoryId=30002&amp;typeId=30005\">suggest updates through seller support</a></b>?\n\n\n" + " \n" + " </div>\n" + "</div>"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html