How to split the string by using given number with whitespaces?

Question

I have a String like below,

String str = "12 67 239 2 47 29";

Here i want to split the above string by using " 2 "

System.out.println(StringUtils.split(str, " 2 ")[0]);

I got a result, 1.

But i want the result like below,

12 67 239 2

How can i do it guys, Please help me.

I think what you want is to get a substring of the string and not to split the string. You can easily do that by implementing a regular expression. It is best that you post the code that you have tried. — Aradhna
– Aradhna, Commented Oct 5, 2017 at 16:33
You are writting on console the first position of your array, not the whole array. Furthermore, I agree with Aradhna, you just don't want to split the string — Aldeguer
– Aldeguer, Commented Oct 5, 2017 at 16:36
@Aradhna why not to split, str.split("(?<=\\s2)\\s+")[0], split accepts a regex as it's first argument. — Avinash Raj
– Avinash Raj, Commented Oct 5, 2017 at 16:36

Avinash Raj · Accepted Answer · 2017-10-05 16:46:08Z

1

Use the below regex to split the string on one or more spaces which exists next to 2.

str.split("(?<=\\s2)\\s+")[0]

(?<=\\s2) positive lookbehind which looks next to the <space>2
\\s+ matches one or more spaces.
Since the split will occur only on the matched characters, the above string should be splitted using the space which exists next to 2 as delimiter.

or

Remove all the characters which exists next to 2.

System.out.println(str.replaceFirst("(\\s2)\\s+.*", "\\1"));

edited Oct 5, 2017 at 16:46

answered Oct 5, 2017 at 16:39

Avinash Raj

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3 Comments

Kannan Arumugam Over a year ago

Thank you very much @Avinash Raj. It's working fine. I have one doubt, in third point which you mentioned in answer, did this work for delimiter with prefix and suffix with white space right?

Kannan Arumugam Over a year ago

Could you please provide the reference (or) tutorial link for "Regular Expression" .

Avinash Raj Over a year ago

@kanna yep, but it would do split on the suffix whitespace. this site covers almost every regex regular-expressions.info/quickstart.html

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