Split space from string not working in Kotlin

Question

Anyone wonder this ? Splitting SPACE (" ") in kotlin is not working, i tried with different regex codes but is not working at all.

Tried with this :

value.split("\\s")[0]; value.split("\\s+")[0]; value.split("\\s++")[0]; 

Then i came up with solution -> Create java constant class which contains this function and returns string array to your kotlin class.

Is there any other solution for this problem where we can directly achieve this thing?

Solution : As @Edson Menegatti said :

KOTLIN Specific : WORKING

values.split("\\s".toRegex())[0] 

Many people suggested this solution : NOT WORKING

values.split(" ")[0]  

But in my case it's not working.

Answer 1

Here's an issue between the Java and Kotlin implementation of String.split.

While the Java implementation does accept a regex string, the Kotlin one does not. For it to work, you need to provide an actual Regex object.

To do so, you would update your code as follows:

value.split("\\s".toRegex())[0] 

Also, as @Thomas suggested, you can just use the regular space character to split your string with:

value.split(" ")[0] 

Final point, if you're only using the first element of the split list, you might want to consider using first() instead of [0] - for better readability - and setting the limit parameter to 2 - for better performance.