Regex Tester#

Regex Tester evaluates a regular expression against local test text.

Steps#

1. Enter a pattern.
2. Configure supported flags.
3. Add representative test text.
4. Review matches and groups.
5. Copy the final expression after testing edge cases.

Performance#

Some patterns can cause expensive backtracking. DevDesk applies bounded processing where supported, but avoid nested ambiguous quantifiers on large input.

Examples#

• Email-like text: test only for your application rules; do not treat a simple regex as complete email validation.
• Named identifiers: use anchors when the whole string must match.
• Search-and-extract: use capturing groups intentionally.

Privacy#

Pattern and test text remain local unless you copy or export them.

Simple examples#

Whole-string identifier:

^[A-Za-z][A-Za-z0-9_-]{2,31}$

Capture a version:

version:\s+(\d+\.\d+\.\d+)

Read the result#

• A match is text accepted by the pattern.
• A capture group is a parenthesized subpart.
• Anchors ^ and $ constrain the start and end.
• Flags can change case sensitivity and multi-line behavior.