How do I find multiple substrings from one string using regex in Java?

Question

I want to find every instance of a number, followed by a comma (no space), followed by any number of characters in a string. I was able to get a regex to find all the instances of what I was looking for, but I want to print them individually rather than all together. I'm new to regex in general, so maybe my pattern is wrong?

This is my code:

String test = "1 2,A 3,B 4,23";
Pattern p = Pattern.compile("\\d+,.+");
Matcher m = p.matcher(test);
while(m.find()) {
  System.out.println("found: " + m.group());
}

This is what it prints:

found: 2,A 3,B 4,23

This is what I want it to print:

found: 2,A
found: 3,B
found: 4,23

Thanks in advance!

score 3 · Accepted Answer · answered Mar 31 '13 at 05:17

3

try this regex

    Pattern p = Pattern.compile("\\d+,.+?(?= |$)");

answered Mar 31 '13 at 05:17

Evgeniy Dorofeev

133,369
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score 3 · Answer 2 · answered Mar 31 '13 at 05:17

3

You could take an easier route and split by space, then ignore anything without a comma:

String values = test.split(' ');

for (String value : values) {
    if (value.contains(",") {
        System.out.println("found: " + value);
    }
}

answered Mar 31 '13 at 05:17

pickypg

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This does seem easier, but I have to add some more conditions later making regex more suitable. Thank you though! – Archer Mar 31 '13 at 05:20
Yout beat me by 4 mins @pickypg – MD. Sahib Bin Mahboob Mar 31 '13 at 05:22
1

@Archer Then i believe it would be better to add this conditions to the question. So people can keep it in mind before answering. – MD. Sahib Bin Mahboob Mar 31 '13 at 05:23

score 1 · Answer 3 · answered Mar 31 '13 at 05:17

What you apparently left out of your requirements statement is where "any number of characters" is supposed to end. As it stands, it ends at the end of the string; from your sample output, it seems you want it to end at the first space.

Try this pattern: "\\d+,[^\\s]*"

How do I find multiple substrings from one string using regex in Java?

3 Answers3

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