I have a string which contains a contiguous chunk of digits and then a contiguous chunk of characters. I need to split them into two parts (one integer part, and one string).
I tried using String.split("\\D", 1)
, but it is eating up first character.
I checked all the String API and didn't find a suitable method.
Is there any method for doing this thing?
Use lookarounds:
str.split("(?<=\\d)(?=\\D)")
\d
is the character class for digits;\D
is its negation. So this zero-matching assertion matches the position where the preceding character is a digit(?<=\d)
, and the following character is a non-digit(?=\D)
.References
Related questions
Alternate solution using limited split
The following also works:
This splits just before we see a non-digit. This is much closer to your original solution, except that since it doesn't actually match the non-digit character, it doesn't "eat it up". Also, it uses
limit
of2
, which is really what you want here.API links
String.split(String regex, int limit)
n
is greater than zero then the pattern will be applied at mostn - 1
times, the array's length will be no greater thann
, and the array's last entry will contain all input beyond the last matched delimiter.There's always an old-fashioned way:
(hope it works with digit-only or char-only Strings too - can't test it here - if not, take it as a general idea)