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JSON FormatterYAML FormatterBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampCron BuilderUUID / ULIDPunycode / IDNBase ConverterACL Generator
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What Is My IP?IPv6 TestSpeed TestHTTP Request Headers
DNS LookupDNS PropagationDNS Health CheckerSPF AnalyzerPTR LookupCAA RecordSRV RecordDNS TraceDNS PrivacyDANE / TLSADNSSEC CheckerSPF BuilderDKIM GeneratorZone DiffPTR Zone Generator
Subnet CalculatorCIDR Range ViewerVLSM CalculatorVLAN PlannerBandwidth CalcIPv6 Subnet CalcIP ↔ BinarySupernet CalcCIDR MergeCIDR to IP RangeCIDR SplitIPv4 → IPv6CIDR OverlapFree IP Space FinderDHCP CalculatorMTU Calculator
WHOIS LookupDomain Age CheckerSubdomain FinderIP GeolocationASN / BGP LookupIP Blacklist CheckReverse IP LookupMAC Address LookupBGP Prefix LookupRPKI / ROA CheckDomain Availability
Email InspectorDKIM CheckerEmail HeadersSMTP Test
SMTP TLS CheckSoon
MX Health CheckEmail SecurityDMARC Generator
Temp MailSoon
Is It Down?SSL/TLS CheckerOpen Port CheckerOG Tag CheckerOCSP CheckerPing / LatencyHTTP InspectorRedirect ChainCSP AnalyzerTech Stack CheckerBetaTracerouteBetaHTTP/2 + HTTP/3robots.txt ViewerSSL Cert DecoderBanner GrabberWebSocket TesterCORS TesterHTTP TimingStructured DataPWA ManifestSEO Auditor
One-Time SecretHash GeneratorPassword StrengthSecurity.txtCT Log SearchAXFR Zone Test
HTTP Sec ScoreSoon
WebRTC Leak TestIP Reputation
JSON FormatterYAML FormatterBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampCron BuilderUUID / ULIDPunycode / IDNBase ConverterACL Generator
CSS Unit ConverterColor ToolkitGradient GeneratorcURL BuilderURL ParserURL Encoder/DecoderHTTP Status CodesBox Shadow GenFavicon GeneratorQR Code GeneratorFlex & Gridrobots.txt Tester
Text CompareCase ConverterText CleanerText AnalyzerText TransformerList ToolsLorem GeneratorSlug Generator
Cloud VPC PlannerCloud IP RangeSecurity GroupsIAM AnalyzerK8s CIDR PlannerFirewall BuilderHCL FormatterEgress Cost CalcCloud DNS Zone
VM Cost EstimatorSoon
Proxmox Net ConfigVMware Port GroupHyper-V vSwitchVXLAN VNI PlannerKVM Net ConfigXCP-ng NetworkNSX-T Segment
Disposable Email DetectorPhone InspectorTor Exit NodeVPN/Proxy DetectDomain ReputationTyposquat DetectUsername SearchFavicon Hash
GitHub ActionsDockerfile Gendocker-composeArgoCD AppK8s Manifests
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Regex Tester

Test regular expressions with real-time match highlighting, flag toggles, match details and replace mode. All processing runs in your browser.

//
Flavor
Mode
Test string
Examples:

Related Tools

JSON Formatter

Paste JSON to format, minify, or validate it instantly. All processing happens in your browser - no data is transmitted.

Base64 / URL Encode

Encode or decode Base64 and URL percent-encoded strings. Supports Unicode. Runs entirely in your browser.

URL Encoder/Decoder

Encode or decode URL percent-encoded strings. Choose the mode that matches your use case - full URL, query string, or single component.

About this tool

This tool uses the JavaScript RegExp engine built into your browser. JavaScript regex syntax follows the ECMAScript standard - it supports most common PCRE features but not lookbehind in older browsers, atomic groups, or possessive quantifiers.

Flags: g (global) finds all matches rather than stopping at the first; i makes matching case-insensitive; m makes ^ and $ match line boundaries; s (dotAll) makes . match newline characters.