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 Foundation let pattern = #"\\\"SOC\\\":([\d\.\,]+),"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #"{ "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" } }"# let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression