javascript 在索引后查找字符串的第一个索引
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Find first index of a string after index
提问by Alon Shmiel
I have a string: "www.google.com.sdg.jfh.sd"
我有一个字符串：“www.google.com.sdg.jfh.sd”
I want to find the first ".s" string that is found after "sdg".
我想找到在“sdg”之后找到的第一个“.s”字符串。
so I have the index of "sdg", by:
所以我有“sdg”的索引，通过：
var start_index = str.indexOf("sdg");
now I need to find the first ".s" index that is found after "sdg"
现在我需要找到在“sdg”之后找到的第一个“.s”索引
any help appreciated!
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采纳答案by matewka
回答by lukas.pukenis
There's a second parameter which controls the starting position of search:
还有第二个参数控制搜索的起始位置：
String.prototype.indexOf(arg, startPosition);
So you can do
所以你可以做
str.indexOf('s', start_index);
回答by jasonslyvia
var str = "www.google.com.sdg.jfh.sd";
var search = "sdg";
var start_index = str.substring(str.indexOf(search) + search.length).indexOf(".s");
