FASTA Header Accession Split

Description

Split a supplied FASTA header into accession and description text.

Sequence formats distinguish coordinate origins, included endpoints, allele separators and identifier grammars. A genomic interbase position differs from a base number, and a parsed optional-field value may still violate its declared type. Local token checks preserve representation without validating a complete file, sequence, reference assembly or biological interpretation.

Split a supplied FASTA header into accession and description text.

When to use this tool

Use FASTA Header Accession Split when you already have header and need to split a supplied FASTA header into accession and description text.

How to use the tool and how it works

Enter header. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read accession, description. Use the output convention below.

Require a leading >, a nonwhitespace accession and no CR/LF. Accept optional space/tab-delimited description and return an empty description if absent.^[1]

Input field	Meaning and units	Accepted input
header	Header	Required. Text; maximum UTF-16 length 8192.

Output field	Interpretation	Returned shape
accession	Accession	Required. Text; maximum UTF-16 length 8192.
description	Description	Required. Text; maximum UTF-16 length 8192.

json

{
  "input": {
    "header": ">SEQ17 sample description"
  },
  "output": {
    "accession": "SEQ17",
    "description": "sample description"
  }
}

Limitations and assumptions

Whitespace is not a universal FASTA database grammar. Description text is retained rather than parsed; no accession resolution, sequence or complete file validation occurs.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.

Alternative or Complementary methods

Use the complete applicable file specification and a full format validator for conformance. Verify reference assembly, sequence bounds, annotation and database context before interpreting local fields or coordinate transformations.

References

Calculation and input contract: bioinformatics/fasta-header-accession-split — tool.io

Similar or alternative tools

FASTA Accession Version Suffix
Split a numeric version suffix from a supplied accession token.
GTF Quoted Attribute Token
Format one supplied GTF-style quoted attribute.