[root@localhost ~]# cat test.txt
aYYYa
bZZZb
ccccc [root@localhost ~]# cat seiki.sh
#!/bin/sh
echo "-----------------"
echo 'case1 ?[Y|Z]+'
egrep "?[Y|Z]+" test.txt
echo "-----------------"
echo ""
echo "-----------------"
echo 'case2 .*'
egrep ".*" test.txt
echo "-----------------"
echo ""
echo "-----------------"
echo 'case3 c{1,}'
egrep "c{1,}" test.txt
echo "-----------------"
echo ""
echo "-----------------"
echo 'case4 c{,1}'
egrep "c{,1}" test.txt
echo "-----------------"
echo ""
[root@localhost ~]# ./seiki.sh
-----------------
case1 ?[Y|Z]+
aYYYa
bZZZb
-----------------
-----------------
case2 .*
aYYYa
bZZZb
ccccc
-----------------
-----------------
case3 c{1,}
ccccc
-----------------
-----------------
case4 c{,1}
-----------------
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