#!/bin/bash

set -x

export LANG=C

echo "بهداد" | grep -G 'ب' --color=always
echo "بهداد" | grep -E 'ب' --color=always
echo "بهداد" | grep -P 'ب' --color=always

export LANG=en_US.UTF8

echo "بهداد" | grep -G '[بی]' --color=always
echo "بهداد" | grep -E '[بی]' --color=always
echo "بهداد" | grep -P '[بی]' --color=always

export LANG=fa_IR.UTF8

echo "بهداد" | grep -G '[بی]' --color=always
echo "بهداد" | grep -E '[بی]' --color=always
echo "بهداد" | grep -P '[بی]' --color=always