.split(".") does not work on the same case where .split("chr") or .split("_") are working

[kubranarci]

I am trying to map a list using chromosome names inside such:

[/filepath/ALL.chr1.GRCh38.phased.CHR.vcf]
[/filepath/ALL.chr2.GRCh38.phased.CHR.vcf]
[/filepath/ALL.chr3.GRCh38.phased.CHR.vcf]

to

[/filepath/ALL.chr1.GRCh38.phased.CHR.vcf, chr1]
[/filepath/ALL.chr2.GRCh38.phased.CHR.vcf, chr2]
[/filepath/ALL.chr3.GRCh38.phased.CHR.vcf, chr3]

This process would be easy if I could just split by "." but it does not work. Anyone has any idea?

[kubranarci]

Answer from Marcel:

Channel
  .fromPath("data/*")
  .set { my_ch }

my_ch.view()

my_ch
  .map { path -> [path, path.name.split("\\.")[1]] }
  .view()

[mribeirodantas]

🥳

[kubranarci]

my solution:

intervals_ch = [chr1, chr2, chr3]
files
        .combine(intervals_ch)
        .filter{it[0].baseName.contains(it[1]+".")}
        .set{new_ch}