Need help matching a mattern using grep/egrep in bash scripting

Question

I am trying to match all characters of given string but those characters should match in the order as given to the bash script.

while [[ $# -gt 0 ]]; do
  case $         


        

Answer 1

Your regex is matching 'a' or 'e' or 'i' because they are in a character set ([]). I think the regular expression you are looking for is

a+.*e+.*i+.*

which matches 'a' one or more times, then anything, then 'e' one or more times, then anything, then 'i' one or more times.