bash 3.0支持進(jìn)程內(nèi)的[正則表達(dá)式]
使用下面的語法：

[[  string =~  regex  ]]

樣例及注意事項(xiàng)：正則表達(dá)式不能使用引號(hào)引起來，引起來后，bash將作為一個(gè)整體

regx_str="abcdefgfootballgame"
echo $BASH
#if [[ $regx_str =~  'foot(ball)(.*)' ]]  
if [[ $regx_str =~  foot(ball)(.*) ]]
then
    echo The regex matches!
    echo $BASH_REMATCH 
    echo ${BASH_REMATCH[1]}
    echo ${BASH_REMATCH[2]}
fi

greet="Hello,World!"
if [[ $greet =~ [1-9] ]]; then
    printf "$greet is a number\n"
else
    printf "$greet is not a number\n"
fi