Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • 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

$re = '/{(\n*.*\n*)}/m'; $str = '2019-03-06 16:17:27 INF Creating container.\\r\\n2019-03-06 16:17:27 INF Container name : [lalaland]\\r\\n2019-03-06 16:17:28 INF Get or Create operation executed successfully.\\r\\n{\\r\\n \\"data\\": {\\r\\n \\"command\\": \\"/usr/sbin/boot.sh\\",\\r\\n \\"created\\": 1551838866,\\r\\n \\"hostConfig\\": {\\r\\n \\"autoRemove\\": false,\\r\\n \\"binds\\": null,\\r\\n \\"blkioDeviceReadBps\\": null,\\r\\n \\"blkioDeviceReadIOps\\": null,\\r\\n \\"blkioDeviceWriteBps\\": null,\\r\\n \\"blkioDeviceWriteIOps\\": null,\\r\\n \\"blkioWeight\\": 0,\\r\\n \\"blkioWeightDevice\\": null,\\r\\n \\"capAdd\\": null,\\r\\n \\"capDrop\\": null,\\r\\n \\"cgroup\\": null,\\r\\n \\"cgroupParent\\": null,\\r\\n \\"consoleSize\\": null,\\r\\n \\"containerIDFile\\": null,\\r\\n \\"cpuCount\\": 0,\\r\\n \\"cpuPercent\\": 0,\\r\\n \\"cpuPeriod\\": 0,\\r\\n \\"cpuQuota\\": 0,\\r\\n \\"cpuRealtimePeriod\\": 0,\\r\\n \\"cpuRealtimeRuntime\\": 0,\\r\\n \\"cpuShares\\": 0,\\r\\n \\"cpusetCpus\\": null,\\r\\n \\"cpusetMems\\": null,\\r\\n \\"deviceCgroupRules\\": null,\\r\\n \\"devices\\": null,\\r\\n \\"diskQuota\\": 0,\\r\\n \\"dns\\": null,\\r\\n \\"dnsOptions\\": null,\\r\\n \\"dnsSearch\\": null,\\r\\n \\"extraHosts\\": null,\\r\\n \\"groupAdd\\": null,\\r\\n \\"ioMaximumBandwidth\\": 0,\\r\\n \\"ioMaximumIOps\\": 0,\\r\\n \\"ipcMode\\": null,\\r\\n \\"isolation\\": null,\\r\\n \\"kernelMemory\\": 0,\\r\\n \\"links\\": null,\\r\\n \\"logConfig\\": null,\\r\\n \\"memory\\": 0,\\r\\n \\"memoryReservation\\": 0,\\r\\n \\"memorySwap\\": 0,\\r\\n \\"memorySwappiness\\": null,\\r\\n \\"nanoCpus\\": 0,\\r\\n \\"networkMode\\": \\"default\\",\\r\\n \\"oomKillDisable\\": false,\\r\\n \\"oomScoreAdj\\": 0,\\r\\n \\"pidMode\\": null,\\r\\n \\"pidsLimit\\": 0,\\r\\n \\"portBindings\\": null,\\r\\n \\"privileged\\": false,\\r\\n \\"publishAllPorts\\": false,\\r\\n \\"readonlyRootfs\\": false,\\r\\n \\"restartPolicy\\": null,\\r\\n \\"runtime\\": null,\\r\\n \\"securityOpt\\": null,\\r\\n \\"shmSize\\": 0,\\r\\n \\"utsMode\\": null,\\r\\n \\"ulimits\\": null,\\r\\n \\"usernsMode\\": null,\\r\\n \\"volumeDriver\\": null,\\r\\n \\"volumesFrom\\": null\\r\\n },\\r\\n \\"id\\": \\"a1fc854544650ec93a1e6964b9de0f045d62618f107056b20abcf0dc4ae0f61a\\",\\r\\n \\"image\\": \\"solace/solace-pubsub-standard:latest\\",\\r\\n \\"imageID\\": \\"sha256:4be92bf62c8526d684d7e45e1db27413b8b5f6f556a5ed3552fb292ee1368cd6\\",\\r\\n \\"mounts\\": [\\r\\n {\\r\\n \\"destination\\": \\"/usr/sw/jail\\",\\r\\n \\"driver\\": \\"local\\",\\r\\n \\"mode\\": \\"\\",\\r\\n \\"name\\": \\"86ef434be868d57068a98056d84b78210452987eebe8794c01bb81a99f0b0ed0\\",\\r\\n \\"propagation\\": \\"\\",\\r\\n \\"rw\\": true,\\r\\n \\"source\\": \\"\\",\\r\\n \\"type\\": \\"volume\\"\\r\\n },\\r\\n {\\r\\n \\"destination\\": \\"/usr/sw/var\\",\\r\\n \\"driver\\": \\"local\\",\\r\\n \\"mode\\": \\"\\",\\r\\n \\"name\\": \\"a816e052177bf96b27b85b8f08667ac04dd0a61fe8a0704872d0056183bb1a90\\",\\r\\n \\"propagation\\": \\"\\",\\r\\n \\"rw\\": true,\\r\\n \\"source\\": \\"\\",\\r\\n \\"type\\": \\"volume\\"\\r\\n },\\r\\n {\\r\\n \\"destination\\": \\"/usr/sw/adb\\",\\r\\n \\"driver\\": \\"local\\",\\r\\n \\"mode\\": \\"\\",\\r\\n \\"name\\": \\"3c999fe711a0f67b3ba76f28275a45184b388714520b1325cea2c9487c22f84e\\",\\r\\n \\"propagation\\": \\"\\",\\r\\n \\"rw\\": true,\\r\\n \\"source\\": \\"\\",\\r\\n \\"type\\": \\"volume\\"\\r\\n },\\r\\n {\\r\\n \\"destination\\": \\"/usr/sw/internalSpool\\",\\r\\n \\"driver\\": \\"local\\",\\r\\n \\"mode\\": \\"\\",\\r\\n \\"name\\": \\"63ede5a141e08d7aca52b474d2f4f3694ddff1dcb0085b356c4ed26597095b57\\",\\r\\n \\"propagation\\": \\"\\",\\r\\n \\"rw\\": true,\\r\\n \\"source\\": \\"\\",\\r\\n \\"type\\": \\"volume\\"\\r\\n },\\r\\n {\\r\\n \\"destination\\": \\"/usr/sw/internalSpool/softAdb\\",\\r\\n \\"driver\\": \\"local\\",\\r\\n \\"mode\\": \\"\\",\\r\\n \\"name\\": \\"146dc96e171076cb165ea046508713c04dc9557002510ab2c37fb54283c2fbf1\\",\\r\\n \\"propagation\\": \\"\\",\\r\\n \\"rw\\": true,\\r\\n \\"source\\": \\"\\",\\r\\n \\"type\\": \\"volume\\"\\r\\n }\\r\\n ],\\r\\n \\"names\\": [\\r\\n \\"lalaland\\"\\r\\n ],\\r\\n \\"networkSettings\\": {\\r\\n \\"bridge\\": null,\\r\\n \\"endpointID\\": null,\\r\\n \\"gateway\\": null,\\r\\n \\"globalIPv6Address\\": null,\\r\\n \\"globalIPv6PrefixLen\\": 0,\\r\\n \\"hairpinMode\\": false,\\r\\n \\"ipAddress\\": null,\\r\\n \\"ipPrefixLen\\": 0,\\r\\n \\"iPv6Gateway\\": null,\\r\\n \\"linkLocalIPv6Address\\": null,\\r\\n \\"linkLocalIPv6PrefixLen\\": 0,\\r\\n \\"macAddress\\": null,\\r\\n \\"networks\\": {\\r\\n \\"bridge\\": {\\r\\n \\"aliases\\": null,\\r\\n \\"driverOpts\\": null,\\r\\n \\"endpointID\\": \\"513a9f23ea2852614e556d61ce13b8cde38da27563de5f9978acf59f7a1834f3\\",\\r\\n \\"gateway\\": \\"172.17.0.1\\",\\r\\n \\"globalIPv6Address\\": \\"\\",\\r\\n \\"globalIPv6PrefixLen\\": 0,\\r\\n \\"ipamConfig\\": null,\\r\\n \\"ipAddress\\": \\"172.17.0.5\\",\\r\\n \\"ipPrefixLen\\": 16,\\r\\n \\"iPv6Gateway\\": \\"\\",\\r\\n \\"links\\": null,\\r\\n \\"macAddress\\": \\"02:42:ac:11:00:05\\",\\r\\n \\"networkID\\": \\"e60ce3b2bf4eb3767372dd896f4a34d147d24e18cfa691aa2d5a152c436050ad\\"\\r\\n }\\r\\n },\\r\\n \\"ports\\": null,\\r\\n \\"sandboxID\\": null,\\r\\n \\"sandboxKey\\": null,\\r\\n \\"secondaryIPAddresses\\": null,\\r\\n \\"secondaryIPv6Addresses\\": null\\r\\n },\\r\\n \\"ports\\": [\\r\\n {\\r\\n \\"privatePort\\": 2222,\\r\\n \\"type\\": \\"tcp\\",\\r\\n \\"ip\\": null,\\r\\n \\"publicPort\\": null\\r\\n },\\r\\n {\\r\\n \\"privatePort\\": 55555,\\r\\n \\"type\\": \\"tcp\\",\\r\\n \\"ip\\": \\"0.0.0.0\\",\\r\\n \\"publicPort\\": 11318\\r\\n },\\r\\n {\\r\\n \\"privatePort\\": 8080,\\r\\n \\"type\\": \\"tcp\\",\\r\\n \\"ip\\": \\"0.0.0.0\\",\\r\\n \\"publicPort\\": 10505\\r\\n }\\r\\n ],\\r\\n \\"state\\": \\"running\\",\\r\\n \\"solaceMessagingConnectionString\\": \\"tcp://cap-docker-poc:11318\\",\\r\\n \\"solaceManagementConnectionString\\": \\"tcp://cap-docker-poc:10505\\",\\r\\n \\"isConnectionToSolaceClientOk\\": true,\\r\\n \\"containerStatus\\": null,\\r\\n \\"messages\\": null,\\r\\n \\"success\\": 0\\r\\n },\\r\\n \\"result\\": 0\\r\\n}\\r\\n { test : test } '; 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