How to Use the Regex Tester:
Enter your regular expression pattern in the regex field and your test string in the input field. Select regex flags (global, case-insensitive, multiline, etc.) and see matches highlighted in real-time. Perfect for testing WordPress custom post type patterns and form validation rules.
Form Validation
Test regex patterns for email validation, phone numbers, and custom field formats in WordPress forms.
Content Filtering
Develop and test patterns for filtering and processing WordPress post content and custom fields.
URL Rewriting
Test regex patterns for WordPress permalink structures and URL rewriting rules.
How Do Regular Expressions Work?
Regular expressions use special characters and patterns to match and manipulate text. The tester evaluates your pattern against test strings and highlights matches, making it easy to debug and refine your regex.
Pattern Matching
Regex patterns use metacharacters (., *, +, ?, etc.) to define flexible matching rules for text.
Flags
Flags like global (g), case-insensitive (i), and multiline (m) modify how the pattern is applied.
Groups and Captures
Parentheses create capture groups that extract specific parts of matched text for further processing.
Using Regular Expressions in JavaScript:
const emailPattern = /^[^s@]+@[^s@]+.[^s@]+$/;
const email = "user@example.com";
const isValid = emailPattern.test(email);
console.log(isValid);true Validate email format using regex pattern
const text = "Contact us at support@example.com or sales@example.com";
const emailPattern = /[w.-]+@[w.-]+.[w]+/g;
const emails = text.match(emailPattern);
console.log(emails);["support@example.com", "sales@example.com"] Extract all email addresses from text using global flag
Frequently asked questions
Flags modify regex behavior: g (global – find all matches), i (case-insensitive), m (multiline), and s (dotall).
Enter your pattern in the regex field, add a test string, and select flags. The tool will highlight matches in real-time.
Capture groups (parentheses) extract specific parts of matched text, allowing you to reference them separately.
Collect Better Feedback with Userback
This regex tester helps you validate patterns efficiently, but understanding how users experience validation errors requires detailed context. Userback captures comprehensive feedback when users encounter form validation issues or content filtering problems. With automatic screenshot capture, browser information, console logs, and form data, you get complete visibility into regex-related user experiences. When developers need to report pattern matching issues or suggest improvements to validation rules, Userback enables them to submit detailed feedback that includes the exact input, expected pattern, and all technical context in a single shareable report.