Extracting signs/symbols from a string in Java

Question

I have a string with signs and i want to get the signs only and put them in a string array, here is what I've done:

String str = "155+40-5+6";

// replace the numbers with spaces, leaving the signs and spaces
String signString = str.replaceAll("[0-9]", " ");

// then get an array that contains the signs without spaces
String[] signsArray = stringSigns.trim().split(" ");

However the the 2nd element of the signsArray is a space, [+ , , -, +]

Thank you for your time.

https://stackoverflow.com/questions/17516049/java-removing-numeric-values-from-string — soorapadman, Sep 04 '17 at 02:18

score 2 · Accepted Answer · answered Sep 04 '17 at 02:18

You could do this a couple of ways. Either replace multiple adjacent digits with a single space:

// replace the numbers with spaces, leaving the signs and spaces
String signString = str.replaceAll("[0-9]+", " ");

Or alternatively in the last step, split on multiple spaces:

// then get an array that contains the signs without spaces
String[] signsArray = signString.trim().split(" +");

iamdeowanshi · Answer 2 · 2017-09-04T02:43:26.737

1

Just replace " " to "" in your code

String str = "155+40-5+6";

// replace the numbers with spaces, leaving the signs and spaces
String signString = str.replaceAll("[0-9]","");

// then get an array that contains the signs without spaces
String[] signsArray = stringSigns.split("");

This should work for you. Cheers

Image of running code enter image description here

edited Sep 04 '17 at 02:43

answered Sep 04 '17 at 02:33

iamdeowanshi

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It doesn't, but using: str.replaceAll("[^+-]+", " "); or str.replaceAll("[0-9]+", " "); does, thanks for your help :) – Muizz Mahdy Sep 04 '17 at 02:35
it worked for me, i have attached image also ..anyways your problem solved – iamdeowanshi Sep 04 '17 at 02:44

Extracting signs/symbols from a string in Java

2 Answers2