This is a very simple pattern I'm using for validation. It assumes that the input is non-null and not an empty string.
Java
static final Pattern UID_PATTERN = Pattern.compile("[[0-9]+\\.]*");
...then to use it, I do something like this...
Java
if (!UID_PATTERN.matcher(myString).matches()) {
throw RuntimeException("String doesn't match the UID pattern");
}
-i
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