substring starting with a char and following with digits in java

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How can I get the substring start with “$r” char following with digits and continue until the last digit. For example for the following strings I want these outputs:

example1: “helloeveryone$r123Stack(overflow24)” -> output:$r123

example2: “dskjlu h5678kjjklds($r34563478jlsd)sdjks%6jkj” -> output:$r34563478

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    December 15, 2016 at 7:04 am

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    You could use a regular expression with String.replaceAll(String, String) on a literal $r followed by one or more digits. Something like,

    String[] arr = { "helloeveryone$r123Stack(overflow24)", 
            "dskjlu h5678kjjklds($r34563478jlsd)sdjks%6jkj" };
    for (String str : arr) {
        System.out.println(str.replaceAll(".*(\$r\d+).*", "$1"));
    }
    

    Output is (as requested)

    $r123
    $r34563478
    
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