Summery: my grep command is not working properly when applied to a vcf but worked fine on a dummy test file. The grep command is putting too many records..

I am trying to pull all records with 1000 Genomes AF < 0.5 from a vcf. the vcf is annotated and for each SNP the AF from 1KGenomes is under an info column "controls_AF_popmax"

This is the surrounding area from an entry:

;non_cancer_AF_popmax=0.0004;controls_AF_popmax=0.0003;MCAP13=.;

This is my grep:

zless my_file.vcf.gz  | grep -v '^#' | grep ';controls_AF_popmax=0\.0[0-4]\|;controls_AF_popmax=\.;' > output.txt

It is pulling records where the AF value is between 1 and 2.338e-05 and the "."

I tried a test .txt and the function worked well:

fadsfad;controls_AF_popmax=0.0003;adsfadsf

dsafdsaf;controls_AF_popmax=.;fadsf

fdasfasd;controls_AF_popmax=0.1;fasdf

where the result is:

fadsfad;controls_AF_popmax=0.0003;adsfadsf

dsafdsaf;controls_AF_popmax=.;fadsf