Capture multiline content between two markers

Test multiline groups safely before you use them to extract headings, code blocks, or templated sections.

Patterns that work on one line often fail when content spans several lines. The tester helps you confirm flags and groups before using the pattern in code.

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How to use it

Step 1

Paste the full multiline sample

Keep the original line breaks because they affect matching behavior.

Step 2

Enable the right flags

Use multiline or dotall behavior deliberately rather than guessing.

Step 3

Inspect the captured section

Verify the group stops at the correct closing marker without swallowing extra text.

Sample input

BEGIN\nline one\nline two\nEND

Expected result

The final regex is easier to port into a parser, script, or template extraction step.

Common mistakes

Forgetting that `.` may not cross newlines.
Writing a greedy group that consumes multiple sections.
Testing only one happy-path block.

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regex capture multiline section

Capture multiline content between two markers

Test multiline groups safely before you use them to extract headings, code blocks, or templated sections.

Patterns that work on one line often fail when content spans several lines. The tester helps you confirm flags and groups before using the pattern in code.

Open the tool Expected result