Regular Expressions 101

Save & Share

  • Regex Version: ver. 5
  • 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

/
/
gm

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 = "^\\.lnr-(.*)\\:before \\{$"; final String string = "@font-face {\n" + " font-family: 'Linearicons-Free';\n" + " src:url('../fonts/Linearicons-Free.eot?w118d');\n" + " src:url('../fonts/Linearicons-Free.eot?#iefixw118d') format('embedded-opentype'),\n" + " url('../fonts/Linearicons-Free.woff2?w118d') format('woff2'),\n" + " url('../fonts/Linearicons-Free.woff?w118d') format('woff'),\n" + " url('../fonts/Linearicons-Free.ttf?w118d') format('truetype'),\n" + " url('../fonts/Linearicons-Free.svg?w118d#Linearicons-Free') format('svg');\n" + " font-weight: normal;\n" + " font-style: normal;\n" + "}\n\n" + ".lnr {\n" + " font-family: 'Linearicons-Free';\n" + " speak: none;\n" + " font-style: normal;\n" + " font-weight: normal;\n" + " font-variant: normal;\n" + " text-transform: none;\n" + " line-height: 1;\n\n" + " /* Better Font Rendering =========== */\n" + " -webkit-font-smoothing: antialiased;\n" + " -moz-osx-font-smoothing: grayscale;\n" + "}\n\n" + ".lnr-home:before {\n" + " content: \"\\e800\";\n" + "}\n" + ".lnr-apartment:before {\n" + " content: \"\\e801\";\n" + "}\n" + ".lnr-pencil:before {\n" + " content: \"\\e802\";\n" + "}\n" + ".lnr-magic-wand:before {\n" + " content: \"\\e803\";\n" + "}\n" + ".lnr-drop:before {\n" + " content: \"\\e804\";\n" + "}\n" + ".lnr-lighter:before {\n" + " content: \"\\e805\";\n" + "}\n" + ".lnr-poop:before {\n" + " content: \"\\e806\";\n" + "}\n" + ".lnr-sun:before {\n" + " content: \"\\e807\";\n" + "}\n" + ".lnr-moon:before {\n" + " content: \"\\e808\";\n" + "}\n" + ".lnr-cloud:before {\n" + " content: \"\\e809\";\n" + "}\n" + ".lnr-cloud-upload:before {\n" + " content: \"\\e80a\";\n" + "}\n" + ".lnr-cloud-download:before {\n" + " content: \"\\e80b\";\n" + "}\n" + ".lnr-cloud-sync:before {\n" + " content: \"\\e80c\";\n" + "}\n" + ".lnr-cloud-check:before {\n" + " content: \"\\e80d\";\n" + "}\n" + ".lnr-database:before {\n" + " content: \"\\e80e\";\n" + "}\n" + ".lnr-lock:before {\n" + " content: \"\\e80f\";\n" + "}\n" + ".lnr-cog:before {\n" + " content: \"\\e810\";\n" + "}\n" + ".lnr-trash:before {\n" + " content: \"\\e811\";\n" + "}\n" + ".lnr-dice:before {\n" + " content: \"\\e812\";\n" + "}\n" + ".lnr-heart:before {\n" + " content: \"\\e813\";\n" + "}\n" + ".lnr-star:before {\n" + " content: \"\\e814\";\n" + "}\n" + ".lnr-star-half:before {\n" + " content: \"\\e815\";\n" + "}\n" + ".lnr-star-empty:before {\n" + " content: \"\\e816\";\n" + "}\n" + ".lnr-flag:before {\n" + " content: \"\\e817\";\n" + "}\n" + ".lnr-envelope:before {\n" + " content: \"\\e818\";\n" + "}\n" + ".lnr-paperclip:before {\n" + " content: \"\\e819\";\n" + "}\n" + ".lnr-inbox:before {\n" + " content: \"\\e81a\";\n" + "}\n" + ".lnr-eye:before {\n" + " content: \"\\e81b\";\n" + "}\n" + ".lnr-printer:before {\n" + " content: \"\\e81c\";\n" + "}\n" + ".lnr-file-empty:before {\n" + " content: \"\\e81d\";\n" + "}\n" + ".lnr-file-add:before {\n" + " content: \"\\e81e\";\n" + "}\n" + ".lnr-enter:before {\n" + " content: \"\\e81f\";\n" + "}\n" + ".lnr-exit:before {\n" + " content: \"\\e820\";\n" + "}\n" + ".lnr-graduation-hat:before {\n" + " content: \"\\e821\";\n" + "}\n" + ".lnr-license:before {\n" + " content: \"\\e822\";\n" + "}\n" + ".lnr-music-note:before {\n" + " content: \"\\e823\";\n" + "}\n" + ".lnr-film-play:before {\n" + " content: \"\\e824\";\n" + "}\n" + ".lnr-camera-video:before {\n" + " content: \"\\e825\";\n" + "}\n" + ".lnr-camera:before {\n" + " content: \"\\e826\";\n" + "}\n" + ".lnr-picture:before {\n" + " content: \"\\e827\";\n" + "}\n" + ".lnr-book:before {\n" + " content: \"\\e828\";\n" + "}\n" + ".lnr-bookmark:before {\n" + " content: \"\\e829\";\n" + "}\n" + ".lnr-user:before {\n" + " content: \"\\e82a\";\n" + "}\n" + ".lnr-users:before {\n" + " content: \"\\e82b\";\n" + "}\n" + ".lnr-shirt:before {\n" + " content: \"\\e82c\";\n" + "}\n" + ".lnr-store:before {\n" + " content: \"\\e82d\";\n" + "}\n" + ".lnr-cart:before {\n" + " content: \"\\e82e\";\n" + "}\n" + ".lnr-tag:before {\n" + " content: \"\\e82f\";\n" + "}\n" + ".lnr-phone-handset:before {\n" + " content: \"\\e830\";\n" + "}\n" + ".lnr-phone:before {\n" + " content: \"\\e831\";\n" + "}\n" + ".lnr-pushpin:before {\n" + " content: \"\\e832\";\n" + "}\n" + ".lnr-map-marker:before {\n" + " content: \"\\e833\";\n" + "}\n" + ".lnr-map:before {\n" + " content: \"\\e834\";\n" + "}\n" + ".lnr-location:before {\n" + " content: \"\\e835\";\n" + "}\n" + ".lnr-calendar-full:before {\n" + " content: \"\\e836\";\n" + "}\n" + ".lnr-keyboard:before {\n" + " content: \"\\e837\";\n" + "}\n" + ".lnr-spell-check:before {\n" + " content: \"\\e838\";\n" + "}\n" + ".lnr-screen:before {\n" + " content: \"\\e839\";\n" + "}\n" + ".lnr-smartphone:before {\n" + " content: \"\\e83a\";\n" + "}\n" + ".lnr-tablet:before {\n" + " content: \"\\e83b\";\n" + "}\n" + ".lnr-laptop:before {\n" + " content: \"\\e83c\";\n" + "}\n" + ".lnr-laptop-phone:before {\n" + " content: \"\\e83d\";\n" + "}\n" + ".lnr-power-switch:before {\n" + " content: \"\\e83e\";\n" + "}\n" + ".lnr-bubble:before {\n" + " content: \"\\e83f\";\n" + "}\n" + ".lnr-heart-pulse:before {\n" + " content: \"\\e840\";\n" + "}\n" + ".lnr-construction:before {\n" + " content: \"\\e841\";\n" + "}\n" + ".lnr-pie-chart:before {\n" + " content: \"\\e842\";\n" + "}\n" + ".lnr-chart-bars:before {\n" + " content: \"\\e843\";\n" + "}\n" + ".lnr-gift:before {\n" + " content: \"\\e844\";\n" + "}\n" + ".lnr-diamond:before {\n" + " content: \"\\e845\";\n" + "}\n" + ".lnr-linearicons:before {\n" + " content: \"\\e846\";\n" + "}\n" + ".lnr-dinner:before {\n" + " content: \"\\e847\";\n" + "}\n" + ".lnr-coffee-cup:before {\n" + " content: \"\\e848\";\n" + "}\n" + ".lnr-leaf:before {\n" + " content: \"\\e849\";\n" + "}\n" + ".lnr-paw:before {\n" + " content: \"\\e84a\";\n" + "}\n" + ".lnr-rocket:before {\n" + " content: \"\\e84b\";\n" + "}\n" + ".lnr-briefcase:before {\n" + " content: \"\\e84c\";\n" + "}\n" + ".lnr-bus:before {\n" + " content: \"\\e84d\";\n" + "}\n" + ".lnr-car:before {\n" + " content: \"\\e84e\";\n" + "}\n" + ".lnr-train:before {\n" + " content: \"\\e84f\";\n" + "}\n" + ".lnr-bicycle:before {\n" + " content: \"\\e850\";\n" + "}\n" + ".lnr-wheelchair:before {\n" + " content: \"\\e851\";\n" + "}\n" + ".lnr-select:before {\n" + " content: \"\\e852\";\n" + "}\n" + ".lnr-earth:before {\n" + " content: \"\\e853\";\n" + "}\n" + ".lnr-smile:before {\n" + " content: \"\\e854\";\n" + "}\n" + ".lnr-sad:before {\n" + " content: \"\\e855\";\n" + "}\n" + ".lnr-neutral:before {\n" + " content: \"\\e856\";\n" + "}\n" + ".lnr-mustache:before {\n" + " content: \"\\e857\";\n" + "}\n" + ".lnr-alarm:before {\n" + " content: \"\\e858\";\n" + "}\n" + ".lnr-bullhorn:before {\n" + " content: \"\\e859\";\n" + "}\n" + ".lnr-volume-high:before {\n" + " content: \"\\e85a\";\n" + "}\n" + ".lnr-volume-medium:before {\n" + " content: \"\\e85b\";\n" + "}\n" + ".lnr-volume-low:before {\n" + " content: \"\\e85c\";\n" + "}\n" + ".lnr-volume:before {\n" + " content: \"\\e85d\";\n" + "}\n" + ".lnr-mic:before {\n" + " content: \"\\e85e\";\n" + "}\n" + ".lnr-hourglass:before {\n" + " content: \"\\e85f\";\n" + "}\n" + ".lnr-undo:before {\n" + " content: \"\\e860\";\n" + "}\n" + ".lnr-redo:before {\n" + " content: \"\\e861\";\n" + "}\n" + ".lnr-sync:before {\n" + " content: \"\\e862\";\n" + "}\n" + ".lnr-history:before {\n" + " content: \"\\e863\";\n" + "}\n" + ".lnr-clock:before {\n" + " content: \"\\e864\";\n" + "}\n" + ".lnr-download:before {\n" + " content: \"\\e865\";\n" + "}\n" + ".lnr-upload:before {\n" + " content: \"\\e866\";\n" + "}\n" + ".lnr-enter-down:before {\n" + " content: \"\\e867\";\n" + "}\n" + ".lnr-exit-up:before {\n" + " content: \"\\e868\";\n" + "}\n" + ".lnr-bug:before {\n" + " content: \"\\e869\";\n" + "}\n" + ".lnr-code:before {\n" + " content: \"\\e86a\";\n" + "}\n" + ".lnr-link:before {\n" + " content: \"\\e86b\";\n" + "}\n" + ".lnr-unlink:before {\n" + " content: \"\\e86c\";\n" + "}\n" + ".lnr-thumbs-up:before {\n" + " content: \"\\e86d\";\n" + "}\n" + ".lnr-thumbs-down:before {\n" + " content: \"\\e86e\";\n" + "}\n" + ".lnr-magnifier:before {\n" + " content: \"\\e86f\";\n" + "}\n" + ".lnr-cross:before {\n" + " content: \"\\e870\";\n" + "}\n" + ".lnr-menu:before {\n" + " content: \"\\e871\";\n" + "}\n" + ".lnr-list:before {\n" + " content: \"\\e872\";\n" + "}\n" + ".lnr-chevron-up:before {\n" + " content: \"\\e873\";\n" + "}\n" + ".lnr-chevron-down:before {\n" + " content: \"\\e874\";\n" + "}\n" + ".lnr-chevron-left:before {\n" + " content: \"\\e875\";\n" + "}\n" + ".lnr-chevron-right:before {\n" + " content: \"\\e876\";\n" + "}\n" + ".lnr-arrow-up:before {\n" + " content: \"\\e877\";\n" + "}\n" + ".lnr-arrow-down:before {\n" + " content: \"\\e878\";\n" + "}\n" + ".lnr-arrow-left:before {\n" + " content: \"\\e879\";\n" + "}\n" + ".lnr-arrow-right:before {\n" + " content: \"\\e87a\";\n" + "}\n" + ".lnr-move:before {\n" + " content: \"\\e87b\";\n" + "}\n" + ".lnr-warning:before {\n" + " content: \"\\e87c\";\n" + "}\n" + ".lnr-question-circle:before {\n" + " content: \"\\e87d\";\n" + "}\n" + ".lnr-menu-circle:before {\n" + " content: \"\\e87e\";\n" + "}\n" + ".lnr-checkmark-circle:before {\n" + " content: \"\\e87f\";\n" + "}\n" + ".lnr-cross-circle:before {\n" + " content: \"\\e880\";\n" + "}\n" + ".lnr-plus-circle:before {\n" + " content: \"\\e881\";\n" + "}\n" + ".lnr-circle-minus:before {\n" + " content: \"\\e882\";\n" + "}\n" + ".lnr-arrow-up-circle:before {\n" + " content: \"\\e883\";\n" + "}\n" + ".lnr-arrow-down-circle:before {\n" + " content: \"\\e884\";\n" + "}\n" + ".lnr-arrow-left-circle:before {\n" + " content: \"\\e885\";\n" + "}\n" + ".lnr-arrow-right-circle:before {\n" + " content: \"\\e886\";\n" + "}\n" + ".lnr-chevron-up-circle:before {\n" + " content: \"\\e887\";\n" + "}\n" + ".lnr-chevron-down-circle:before {\n" + " content: \"\\e888\";\n" + "}\n" + ".lnr-chevron-left-circle:before {\n" + " content: \"\\e889\";\n" + "}\n" + ".lnr-chevron-right-circle:before {\n" + " content: \"\\e88a\";\n" + "}\n" + ".lnr-crop:before {\n" + " content: \"\\e88b\";\n" + "}\n" + ".lnr-frame-expand:before {\n" + " content: \"\\e88c\";\n" + "}\n" + ".lnr-frame-contract:before {\n" + " content: \"\\e88d\";\n" + "}\n" + ".lnr-layers:before {\n" + " content: \"\\e88e\";\n" + "}\n" + ".lnr-funnel:before {\n" + " content: \"\\e88f\";\n" + "}\n" + ".lnr-text-format:before {\n" + " content: \"\\e890\";\n" + "}\n" + ".lnr-text-format-remove:before {\n" + " content: \"\\e891\";\n" + "}\n" + ".lnr-text-size:before {\n" + " content: \"\\e892\";\n" + "}\n" + ".lnr-bold:before {\n" + " content: \"\\e893\";\n" + "}\n" + ".lnr-italic:before {\n" + " content: \"\\e894\";\n" + "}\n" + ".lnr-underline:before {\n" + " content: \"\\e895\";\n" + "}\n" + ".lnr-strikethrough:before {\n" + " content: \"\\e896\";\n" + "}\n" + ".lnr-highlight:before {\n" + " content: \"\\e897\";\n" + "}\n" + ".lnr-text-align-left:before {\n" + " content: \"\\e898\";\n" + "}\n" + ".lnr-text-align-center:before {\n" + " content: \"\\e899\";\n" + "}\n" + ".lnr-text-align-right:before {\n" + " content: \"\\e89a\";\n" + "}\n" + ".lnr-text-align-justify:before {\n" + " content: \"\\e89b\";\n" + "}\n" + ".lnr-line-spacing:before {\n" + " content: \"\\e89c\";\n" + "}\n" + ".lnr-indent-increase:before {\n" + " content: \"\\e89d\";\n" + "}\n" + ".lnr-indent-decrease:before {\n" + " content: \"\\e89e\";\n" + "}\n" + ".lnr-pilcrow:before {\n" + " content: \"\\e89f\";\n" + "}\n" + ".lnr-direction-ltr:before {\n" + " content: \"\\e8a0\";\n" + "}\n" + ".lnr-direction-rtl:before {\n" + " content: \"\\e8a1\";\n" + "}\n" + ".lnr-page-break:before {\n" + " content: \"\\e8a2\";\n" + "}\n" + ".lnr-sort-alpha-asc:before {\n" + " content: \"\\e8a3\";\n" + "}\n" + ".lnr-sort-amount-asc:before {\n" + " content: \"\\e8a4\";\n" + "}\n" + ".lnr-hand:before {\n" + " content: \"\\e8a5\";\n" + "}\n" + ".lnr-pointer-up:before {\n" + " content: \"\\e8a6\";\n" + "}\n" + ".lnr-pointer-right:before {\n" + " content: \"\\e8a7\";\n" + "}\n" + ".lnr-pointer-down:before {\n" + " content: \"\\e8a8\";\n" + "}\n" + ".lnr-pointer-left:before {\n" + " content: \"\\e8a9\";\n" + "}\n"; 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