#!/bin/bash
s='Aachen,1,Valid,L5,21,Fell,01/01/1880 12:00:00 AM,50.775000,6.083330,"(50.775; 6.08333)"
Aarhus,2,Valid,H6,720,Fell,01/01/1951 12:00:00 AM,56.183330,10.233330,"(56.18333; 10.23333)"
Abee,6,Valid,EH4,107000,Fell,01/01/1952 12:00:00 AM,54.216670,-113.000000,"(54.21667; -113.0)"
Acapulco,10,Valid,Acapulcoite,1914,Fell,01/01/1976 12:00:00 AM,16.883330,-99.900000,"(16.88333; -99.9)"'
 
rx=',([0-9]{1,2}(\.[0-9]{1,3})?),'
 
while IFS= read -a line; do
  if [[ "$line" =~ $rx ]]; then
    echo "${BASH_REMATCH[1]}";
  fi
done  <<< "$s"

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