如何删除文本中第n个字符之前的字符串？

Question

I have a dynamically generated text like this

xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0

How can I remove everything before Map ... ? I know there is a hard coded way to do this by using substring() but as I said these strings are dynamic and before Map .. can change so I need to do this dynamically by removing everything before 4th index of - character.

Answer 1

You could remove all four minuses and the characters between from start of the string.

 var string = 'xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0', stripped = string.replace(/^([^-]*-){4}/, ''); console.log(stripped); 

Answer 2

I would just find the index of Map and use it to slice the string:

 let str = "xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0" let ind = str.indexOf("Map") console.log(str.slice(ind)) 

If you prefer a regex (or you may have occurrences of Map in the prefix) you man match exactly what you want with:

 let str = "xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0" let arr = str.match(/^(?:.+?-){4}(.*)/) console.log(arr[1]) 

Answer 3

我只是在Map一词上拆分，然后取第一个索引

var splitUp = 'xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0'.split('Map') var firstPart = splitUp[0]

Answer 4

Uses String.replace with regex expression should be the popular solution.

Based on the OP states: so I need to do this dynamically by removing everything before 4th index of - character. ,

I think another solution is split('-') first, then join the strings after 4th - .

 let test = 'xxxxxx-xxxx-xxxxx-xxxxx-Map-B-844-0' console.log(test.split('-').slice(4).join('-'))