Regex Tester

Test regular expressions with real-time matching and detailed analysis

Regular Expression Pattern

Regex Flags

Global

Find all matches rather than stopping after the first match

IgnoreCase

Case-insensitive matching

Multiline

^$ match line breaks

DotAll

. matches newline characters

Unicode

Unicode matching

Sticky

Matches only from the index indicated by lastIndex

Test String

Common Regex Patterns

Pattern	Regex	Description
Email	`[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}`	Basic email validation
Phone	`$?([0-9]{3})$?[-. ]?([0-9]{3})[-. ]?([0-9]{4})`	US phone number
URL	`https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)`	URL validation
IPv4	`\b(?:(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?)\b`	IPv4 address
Date (YYYY-MM-DD)	`\d{4}-\d{2}-\d{2}`	ISO date format
Time (HH:MM)	`([01]?[0-9]\|2[0-3]):[0-5][0-9]`	24-hour time format
Hex Color	`#([A-Fa-f0-9]{6}\|[A-Fa-f0-9]{3})`	Hexadecimal color codes
Credit Card	`\d{4}[\s-]?\d{4}[\s-]?\d{4}[\s-]?\d{4}`	Credit card number format

Regex Reference

Character Classes

. - Any character except newline

\\d - Digit [0-9]

\\w - Word character [A-Za-z0-9_]

\\s - Whitespace

Quantifiers

* - 0 or more

+ - 1 or more

? - 0 or 1

{n,m} - Between n and m

Anchors

^ - Start of line

$ - End of line

\\b - Word boundary