Module region 

Region string parsing utilities.

This module provides functions for parsing genomic region strings in the standard format used by samtools, bcftools, and other htslib-based tools.

Supported Formats

• chr - entire chromosome
• chr:start - from start position to end of chromosome
• chr:start-end - specific range

Coordinate Systems

Input coordinates are 1-based inclusive (standard VCF/genomics convention). Output coordinates are 0-based for direct use with htslib APIs.

Example

use htsvcf_core::region::parse_region_1based;

// Parse "chr1:1000-2000" (1-based input)
let (chrom, start0, end0) = parse_region_1based("chr1:1000-2000").unwrap();
assert_eq!(chrom, "chr1");
assert_eq!(start0, 999);  // 0-based
assert_eq!(end0, Some(1999));  // 0-based

// Commas in numbers are stripped
let (_, start0, _) = parse_region_1based("chr1:1,000,000").unwrap();
assert_eq!(start0, 999_999);

Functions

parse_region_1based

Parse a region string like chr, chr:100, or chr:100-200.