Visual Regex Builder

Build regex patterns visually with an intuitive drag-and-drop interface

Building complex patterns? CraftPrompts helps you generate regex patterns from natural language descriptions.

Pattern Canvas

Drag blocks here to build your regex pattern

Drag blocks from the palette to start building your pattern

How to Use

Building Patterns

  • •Select a block type from the palette (characters, quantifiers, anchors)
  • •Drag and drop blocks into the pattern builder area
  • •Configure each block by clicking on it and adjusting settings
  • •Arrange blocks in the order you need them
  • •The generated regex pattern updates automatically

Testing Your Pattern

  • •Enter test text in the test area to see matches
  • •Matches are highlighted in real-time as you build
  • •View match statistics and capture groups
  • •Copy the generated pattern for use in your code
  • •Export your pattern with different programming language syntax

Available Block Types

Character Classes

Match specific types of characters

  • Digit: Matches any number (0-9)
  • Word: Matches letters, numbers, and underscore
  • Letter: Matches any alphabetic character

Quantifiers

Specify how many times a pattern should repeat

  • One or more (+)
  • Zero or more (*)
  • Optional (?)

Anchors

Match positions in the text

  • Start of string (^)
  • End of string ($)
  • Word boundary (\b)

Common Use Cases

Email Validation

Build a pattern to validate email addresses

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

Phone Numbers

Match US phone numbers in XXX-XXX-XXXX format

\d{3}-\d{3}-\d{4}

URL Matching

Find URLs in text (http or https)

https?://[^\s]+

Date Format

Match dates in YYYY-MM-DD format

\d{4}-\d{2}-\d{2}