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Regex Tester

Test and evaluate regular expressions in real-time with capture group diagnostics.

DEV UTILITY
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Flags:
check_circleValid Syntax
Test String 277 chars · 2 lines 
Contact our core triage leads via alex.morgan@corp-cloud.internal or escalation agent support-desk@techops.io for emergency fixes.
Also archive legacy pings sent to dev-null@old-systems.net and verify billing alert root at invoices_2025@accounts-center.org before payroll sync.
Matches highlighted live
Match Inspector 4 Matches
0.20 ms
1 Match #1
Index: 34-62 (28 chars)
alex.morgan@corp-cloud.inter
Group Identifier Captured Token
Group 1 alex.morgan
Group 2 corp-cloud
Group 3 inter
2 Match #2
Index: 86-109 (23 chars)
support-desk@techops.io
Group Identifier Captured Token
Group 1 support-desk
Group 2 techops
Group 3 io
3 Match #3
Index: 165-189 (24 chars)
dev-null@old-systems.net
Group Identifier Captured Token
Group 1 dev-null
Group 2 old-systems
Group 3 net
4 Match #4
Index: 223-256 (33 chars)
invoices_2025@accounts-center.org
Group Identifier Captured Token
Group 1 invoices_2025
Group 2 accounts-center
Group 3 org

analytics Pattern Telemetry

Matches 4
Captures 12
Coverage 39%
Text Character Stream Distribution 277 chars
menu_book

Syntax Quick Sheet

Click token to insert
Character Classes
Quantifiers
Anchors & Groups
checklist

How to Test Regular Expressions

01 Construct Regex

Write your search pattern between standard delimiters. Configure modifiers like g for comprehensive searching and i to ignore case.

02 Supply String Corpus

Paste target logs, server payloads, or code excerpts into the test canvas. Real-time syntax overlays highlight matches and non-matching chunks instantly.

03 Inspect Groups & Offsets

Examine matched sub-expressions in the capture tree. Trace positional char ranges [start:end] for reliable parsing pipeline integration.

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HOW TO USE

Test a JavaScript pattern

Enter a pattern without surrounding slashes, select flags and paste test text to inspect matches and groups.

Example

Pattern \d+ finds 123 and 45 in One 123 then 45 when global matching is enabled.

Before you use the result

This uses JavaScript regular expressions. Very costly patterns on long text can slow the browser.