Java: Find Integers in a String (Calculator) -

if have string looks this: string calc = "5+3". can substring integers 5 , 3?

in case, know how string looks, this: string calc = "55-23" therefore, want know if there way identify integers in string.

for that, regular expression friend:

string text = "string calc = 55-23"; matcher m = pattern.compile("\\d+").matcher(text); while (m.find())     system.out.println(m.group()); 

output

55 23 

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now, might need expand support decimals:

string text = "string calc = 1.1 + 22 * 333 / (4444 - 55555)"; matcher m = pattern.compile("\\d+(?:.\\d+)?").matcher(text); while (m.find())     system.out.println(m.group()); 

output

1.1 22 333 4444 55555