Sequence extraction
Extract letters using a sequence of positions.
Extract characters using prime numbers, Fibonacci, perfect squares, multiples of a number, or custom positions. Use one-based or zero-based numbering and choose how the source text is cleaned.
Quick explanation
Paste the text to analyze, select a position sequence, and choose the numbering system. The tool extracts characters at valid positions and displays the list of positions that were actually used.
Try this too
Need a more flexible extraction rule?
Use the Letter extractor to apply more general positions, patterns, or masks to text.
Additional information
Tool currently being tested and written
Sequence extraction is currently being tested and written.
A cleaner, clearer and more polished version will arrive on the site soon. It will replace this temporary block with notes that match the actual behavior of the tool.
Until then, you can use the tool interface, keeping in mind that its presentation and explanations may still evolve.
Limits and reuse
AppErgo tools are provided free of charge for practical and informational purposes. Although care is taken in their design, a result may be incomplete, unexpected or incorrect. Before relying on a result for any important use, check it using an appropriate method.
To report a bug in the tool, you can use the dedicated bug report form.
Results produced by AppErgo tools may be copied and reused freely. When publicly reusing a result, a method or an AppErgo page, a link to the relevant page is appreciated.
Unless otherwise stated, AppErgo texts, images, visual elements, scripts, templates and internal components remain the property of AppErgo.
For any other request, you can contact the webmaster.