ExtractRegions #

Extract from multiple fixed position regions.

[[step]]
    action = "ExtractRegions"
    regions = [
        {segment = "read1", start = 0, length = 8},
        {segment = "read1", start = 12, length = 4},
    ]
    out_label = "barcode"

This transformation extracts multiple fixed-length regions from reads and concatenates them into a single tag.

ExtractRegions with only one region are exactly equivalent to ExtractRegion.

If the read is shorter than requested, the region will be shorter (and might be of varying length).