Simple regexp match

What's the correct regex to match such set [1] [2] [3] [4] [23] - where numbers are inside the brackets. (I need to get the brackets thoug开发者_C百科h)

The regex \[[0-9]+\] will match anything like '[1]', '[2]', '[678]'. A more precise regex, which catches one or more of these patterns in sequence, is:

((\[[0-9]+\])( |$))+

I'm not familiar with Java regex, but if it's PCRE, I think it should be:

/(\[\d+\])/

I wasn't exactly sure if you need the brackets in the match, but if you don't, I think you could use

/\[(\d+)\]/

If you don't need to capture any of the numbers the following expression will match a string with that pattern:

(?:\[\d+\]\s?)+

The following seems to work:

Pattern pattern = Pattern.compile("(\\[\\d+\\])\\s*");
Matcher matcher = pattern.matcher("[1] [2] [3] [4] [23]");
while (matcher.find()) {
    System.out.println("match = " + matcher.group(1));
}