#!/bin/sh
aa="USD/GBP"
#aa="USD/JPY"
bb="abc a USD/GBP OWE"
#=========method-1=====(bash 3+)
#[[ "$bb" =~ "$aa" ]] && echo $aa
#=========method-2=====
#case $aa in
# $bb)
# echo $aa;;
# *)
# echo $bb;;
#esac
#=========method-3=====
#[[ $bb == *$aa* ]] && echo $aa
#=========method-4=====
if echo $bb |grep -q "$aa";then
echo $aa
else
echo $bb
fi
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