工欲善其事

判断两字符串是否包含

1. 利用grep查找

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

2. 利用字符串运算符

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

3. 利用通配符

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

4. 利用case in 语句

   thisString="1 2 3 4 5" # 源字符串
   searchString="1 2" # 搜索字符串
   case $thisString in 
       *"$searchString"*) echo Enemy Spot ;;
       *) echo nope ;;
   esa
   

5. 利用替换

   STRING_A=$1
   STRING_B=$2
   if [[ ${STRING_A/${STRING_B}//} == $STRING_A ]]
       then
           ## is not substring.
           echo N
           return 0
       else
           ## is substring.
           echo Y
           return 1
       fi