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

use strict; my $str = '{ "val": "{\\"InverterStatus\\":5,\\"InputPower\\":270,\\"PV1Voltage\\":362.9,\\"PV1InputCurrent\\":0.7,\\"PV1InputPower\\":257.9,\\"PV2Voltage\\":288.4,\\"PV2InputCurrent\\":0,\\"PV2InputPower\\":20.9,\\"OutputPower\\":496.7,\\"GridFrequency\\":49.98,\\"L1ThreePhaseGridVoltage\\":241.5,\\"L1ThreePhaseGridOutputCurrent\\":2.3,\\"L1ThreePhaseGridOutputPower\\":492.9,\\"L2ThreePhaseGridVoltage\\":0,\\"L2ThreePhaseGridOutputCurrent\\":0,\\"L2ThreePhaseGridOutputPower\\":0,\\"L3ThreePhaseGridVoltage\\":0,\\"L3ThreePhaseGridOutputCurrent\\":0,\\"L3ThreePhaseGridOutputPower\\":0,\\"TodayGenerateEnergy\\":27.9,\\"TotalGenerateEnergy\\":6828.3,\\"TWorkTimeTotal\\":5.903158e7,\\"PV1EnergyToday\\":12.3,\\"PV1EnergyTotal\\":3153.6,\\"PV2EnergyToday\\":17.1,\\"PV2EnergyTotal\\":3378.2,\\"PVEnergyTotal\\":6554.4,\\"InverterTemperature\\":36,\\"TemperatureInsideIPM\\":33.3,\\"BoostTemperature\\":35.9,\\"DischargePower\\":0,\\"ChargePower\\":0,\\"BatteryVoltage\\":53.3,\\"SOC\\":100,\\"ACPowerToUser\\":0,\\"ACPowerToUserTotal\\":0,\\"ACPowerToGrid\\":81,\\"ACPowerToGridTotal\\":81,\\"INVPowerToLocalLoad\\":200,\\"INVPowerToLocalLoadTotal\\":200,\\"BatteryTemperature\\":26,\\"BatteryState\\":5,\\"EnergyToUserToday\\":1.2,\\"EnergyToUserTotal\\":8244.3,\\"EnergyToGridToday\\":0.8,\\"EnergyToGridTotal\\":217.9,\\"DischargeEnergyToday\\":8.8,\\"DischargeEnergyTotal\\":3086.6,\\"ChargeEnergyToday\\":10.8,\\"ChargeEnergyTotal\\":3092.5,\\"LocalLoadEnergyToday\\":27.8,\\"LocalLoadEnergyTotal\\":14574.9,\\"ACChargeEnergyToday\\":0.4,\\"ACChargeEnergyTotal\\":840.4,\\"Mac\\":\\"48:55:19:68:30:C9\\",\\"Cnt\\":100808}", "ack": true, "ts": 1719331820944, "q": 0, "from": "system.adapter.mqtt.0", "user": "system.user.admin", "lc": 1719331820944, "_id": "mqtt.0.SPH4600", "common": { "name": "SPH4600", "write": true, "read": true, "role": "variable", "desc": "mqtt server variable", "type": "string" }, "native": { "topic": "SPH4600" }, "type": "state", "acl": { "object": 1636, "state": 1636, "owner": "system.user.dressman79", "ownerGroup": "system.group.user" } }'; my $regex = qr/\\\"SOC\\\":([\d\.\,]+),/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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 Perl, please visit: http://perldoc.perl.org/perlre.html