Regular Expressions 101

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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 = "\\\\\\\"SOC\\\\\\\":([\\d\\.\\,]+),"; final String string = "{ \"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\" } }"; 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