fork(2) download 
  1. #!/bin/bash
  2. s='Some.text.1234.text
  3. Some.text.1234.i10u20.text
  4. Some.text.1234.I01U02.text
  5. Some.text.1234.i83U23.text'
  6. for f in $s; do
  7.   if [[ "${f^^}" =~ I[0-9]{2}U[0-9]{2} ]]; then
  8.     echo "$f is invalid";
  9.   else
  10.      echo "$f is valid"
  11.   fi;
  12. done;
Success #stdin #stdout 0s 4636KB
comments (?)
stdin 
Standard input is empty
stdout 
Some.text.1234.text is valid
Some.text.1234.i10u20.text is invalid
Some.text.1234.I01U02.text is invalid
Some.text.1234.i83U23.text is invalid
https://ideone.com/EwZxUm
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!