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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(?P<date>\w{3}\s+\d{1,2}\s\d\d:\d\d:\d\d)\s+(?P<device>\S+)\s+(?:[^:]+:\s)@@(?P<sid_number>\d+),(?P<sid>[^,]+),(?:""zoneUUID""=""(?P<zone_uuid>[^""]+)"",|""apMac""=""(?P<ap_mac>[^""]+)"",|""clientMac""=""(?P<client_mac>[^""]+)"",|""bssid""=""(?P<bssid>[^""]+)"",|""userId""=""(?P<user_id>[^""]*)"",|""wlanId""=""(?P<wlanId>\d+)"",|""iface""=""(?P<iface>\S+)"",|""tenantUUID""=""(?P<tenantUUID>\S+)""|""apName""=""(?P<ap_name>[^""]+)"",|""rogueMac""=""(?P<rogue_mac>[^""]+)"",|""ssid""=""(?P<ssid>[^""]*)"",|""wlanId""=""(?P<wlan_id>[^""]+)"",|""radio""=""(?P<radio>[^""]+)"",|""channel""=""(?P<channel>[^""]+)"",|""timestamp""=""(?P<timestamp>\d{10})[^""]*"",|""apLocation""=""(?P<ap_location>[^""]+)"",?|""timeZone""=""(?P<time_zone>[^""]+)"",|""zoneName""=""(?P<zone_name>[^""]+)"",?|""reason""=""(?P<reason>[^""]+)"",|""fwVersion""=""(?P<fwVersion>[^""]+)"",|""model""=""(?P<model>[^""]+)"",|""nodeName""=""(?P<node_name>[^""]+)"",|""licenseServerName""=""(?P<licenseServerName>[^""]+)"",?)+"""; string input = @"Nov 26 19:09:07 vsz01 Core: @@205,clientInactivityTimeout,""apMac""=""90:3a:72:2f:10:70"",""clientMac""=""00:34:da:1d:7f:83"",""ssid""=""DIGITROL COLABORADORES"",""bssid""=""90:3a:72:af:10:7c"",""userId""=""fgfhf"",""wlanId""=""14"",""iface""=""wlan34"",""tenantUUID""=""839f87c6-d116-497e-afce-aa8157abd30c"",""apName""=""DIGITROL AP R310-18329"",""clientIP""=""192.168.25.62"",""userName""=""0034da1d7f83"",""vlanId""=""1"",""radio""=""a/n/ac"",""encryption""=""WPA2-AES"",""osType""=""Android"",""hostname""=""android-6d4a9dbc81fecfcf"",""firstAuth""=""1543259331"",""associationTime""=""1543252166"",""ipAssignTime""=""1543259332"",""disconnectTime""=""1543259346"",""sessionDuration""=""15"",""disconnectReason""=""4"",""rxFrames""=""26"",""rxBytes""=""3551"",""txFrames""=""54"",""txBytes""=""5738"",""peakRx""=""3551"",""peakTx""=""5738"",""rssi""=""12"",""receivedSignalStrength""=""-93"",""Instantaneous rssi""=""0"",""Xput""=""0"",""fwVersion""=""3.6.1.0.354"",""model""=""R310"",""wlanGroupUUID""=""3ab644a3-7eee-11e8-b12e-000000939903"",""zoneUUID""=""2babcf8c-ab2a-4283-aedc-3ac00c525734"",""zoneName""=""Digitrol"",""timeZone""=""BRT+3BRST,M10.3.0/00:00,M2.3.0/00:00"",""apLocation""="",""apGps""="",""apIpAddress""=""192.168.25.8"",""apIpv6Address""="",""apGroupUUID""=""1bc2200a-2251-4a04-a7db-0f888e3fa776"",""domainId""=""1f90466b-4b53-4b19-b0ed-47c8778f269c"",""idealEventVersion""=""3.5.0"",""apDescription""="""; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx