正则表达式，用于分割字符串中的双整数和整数

Question

i need a regular expression to separate integer and double elements of a string, like the example below:

String input = "We have the number 10 and 10.3, and i want to split both";
String[] splitted = input.split(/*REGULAR EXPRESSION*/);
for(int i=0;i<splitted.length;i++)
    System.out.println("[" + i + "]" + " -> \"" + splitted[i] + "\"");

And the output will be:

• [0] -> "We have the number "
• [1] -> "10"
• [2] -> " and "
• [3] -> "10.3"
• [4] -> ", and i want to split both"

Can someone help me? I will be grateful.

Answer 1

You need to match these chunks with:

\D+|\d*\.?\d+

See the regex demo

Details :

• \\D+ - 1 or more chars other than digits
• | - or
• \\d*\\.?\\d+ - a simple integer or float (might be enhanced to [0-9]*[.]?[0-9]+(?:[eE][-+]?[0-9]+)? , see source )

A Java demo :

String s = "We have the number 10 and 10.3, and i want to split both";
Pattern pattern = Pattern.compile("\\D+|\\d*\\.?\\d+");
Matcher matcher = pattern.matcher(s);
List<String> res = new ArrayList<>();
while (matcher.find()){
    res.add(matcher.group(0)); 
} 
System.out.println(res);