shell 判断字符串包含的5种方法

strA="long string"
strB="string"
result=$(echo $strA | grep "${strB}")
if [[ "$result" != "" ]]
then
    echo "包含"
else
    echo "不包含"
fi

strA="helloworld"
strB="low"
if [[ $strA =~ $strB ]]
then
    echo "包含"
else
    echo "不包含"
fi

A="helloworld"
B="low"
if [[ $A == *$B* ]]
then
    echo "包含"
else
    echo "不包含"
fi

thisString="1 2 3 4 5" # 源字符串
searchString="1 2" # 搜索字符串
case $thisString in
    *"$searchString"*) echo "包含" ;;
    *) echo "不包含" ;;
esac

STRING_A=$
STRING_B=$
if [[ ${STRING_A/${STRING_B}//} == $STRING_A ]];then
    ## is not substring.
    echo "包含"
    exit
else
    ## is substring.
    echo "不包含"
    exit
fi

参考：

网站 stackoverflow 以及segmentfault。