如何打印行直到有效的电子邮件ID进入shell？

Question

#!/bin/sh

while read line 
do
    echo "Name: " "$line"
    while []; do
        #statements
    done
done <input.txt

Answer 1

验证输入时使用break。 例如：

while read -rp "Please enter email address " line ; do
   if [[ "$line" =~ ^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$ ]]; then
      echo OK
      break
   else
      echo "Try again"
   fi
done