请教怎样判断输入的是否为整数

Shell_HAT

回复 10# 123freebird


/是替换第一个匹配，//是替换所有的匹配

jason680

回复 10# 123freebird

did you see the red word and understand them with different between one and two slash (/ and //).

我們也可以對變量值裡的字串作替換：
${file/dir/path}：將第一個 dir 提換為 path：/path1/dir2/dir3/my.file.txt
${file//dir/path}：將全部 dir 提換為 path：/path1/path2/path3/my.file.txt   

howge

回复 2# yinyuemi

学习~~


   

waker

钻下牛角尖儿
1.3e5是不是整数
-3是不是整数

winway1988

1. ${string/substring/replacement}
   
2. Replace first match of $substring with $replacement.
   
3. ${string//substring/replacement}
   
4. Replace all matches of $substring with $replacement.

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1. What happens if no $replacement string is supplied?
   
2. A simple deletion takes place.

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