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

/
/
gm

Test String

Code Generator

Language

Generated Code

$re = '/^(?<longtime>[^ ]+\s[^ ]+)\s\[(?<thread>[^\]]+)\]\s\[(?<loglevel>[A-Z]+)(?>[^\(]+)\((?<process>[^\)]+)\)\s+(?<message>.+)$/m'; $str = '2019-06-05 09:35:43,001 [http-bio-8080-exec-4278] [ERROR] (o.a.r.v.i.MavenMetadataInterceptor:175) - IO exception retrieving maven metadata content from repo \'codehaus\': Failed to parse metadata: end tag name </head> must be the same as start tag <meta> from line 25 (position: TEXT seen ... maximum-scale=1.0; user-scalable=0;" name="viewport">\\n </head>... @26:12) . 2019-06-04 15:36:16,981 [http-bio-8080-exec-4248] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:org/sonarsource/scanner/maven/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:16,981 [http-bio-8080-exec-4254] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:com/spotify/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:16,981 [http-bio-8080-exec-4236] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:com/spotify/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:16,982 [http-bio-8080-exec-4256] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:org/sonarsource/scanner/maven/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,024 [http-bio-8080-exec-4237] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:org/codehaus/mojo/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,024 [http-bio-8080-exec-4238] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:org/apache/maven/plugins/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,025 [http-bio-8080-exec-4216] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:org/apache/maven/plugins/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,026 [http-bio-8080-exec-4257] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:org/codehaus/mojo/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,071 [http-bio-8080-exec-4213] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:org/sonarsource/scanner/maven/sonar-maven-plugin/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:17,072 [http-bio-8080-exec-4251] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:org/sonarsource/scanner/maven/sonar-maven-plugin/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:19,116 [http-bio-8080-exec-4242] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-snapshot-local:org/apache/maven/plugins/maven-compiler-plugin/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:19,116 [http-bio-8080-exec-4248] [WARN ] (o.a.r.ArtifactoryResponseBase:105) - Sending HTTP error code 403: Download request for repo:path \'ext-release-local:org/apache/maven/plugins/maven-compiler-plugin/maven-metadata.xml\' is forbidden for user \'gispa-service-r00\'. 2019-06-04 15:36:40,714 [art-exec-3128064] [INFO ] (o.a.s.a.ArchiveIndexerImpl:147) - Indexing archive: libs-snapshot-local:ru/russianpost/gispa/aps/appeals-boot/1.3.11-SNAPSHOT/appeals-boot-1.3.11-20190604.123558-2.jar 2019-06-04 15:36:41,094 [art-exec-3128064] [INFO ] (o.a.s.a.ArchiveIndexerImpl:147) - Indexing archive: libs-snapshot-local:ru/russianpost/gispa/aps/appeals-boot/1.3.11-SNAPSHOT/appeals-boot-1.3.11-20190604.123558-2-sources.jar 2019-06-04 15:36:41,112 [art-exec-3128064] [INFO ] (o.a.s.a.ArchiveIndexerImpl:147) - Indexing archive: libs-snapshot-local:ru/russianpost/gispa/aps/appeals-boot/1.3.11-SNAPSHOT/appeals-boot-1.3.11-20190604.123558-2-javadoc.jar 2019-06-04 15:36:41,140 [art-exec-3128064] [INFO ] (o.a.s.a.ArchiveIndexerImpl:147) - Indexing archive: libs-snapshot-local:ru/russianpost/gispa/aps/appeals-boot/1.3.11-SNAPSHOT/appeals-boot-1.3.11-20190604.123558-2-docker-info.jar'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php