According to an article on the java2s.com, the following regex codes are equivalent:

Code:
X{n,}?
"Matches X at least n times"

Code:
X{n,}
"Matches X at least n times"

You can take a look at the link to see what I mean. The question mark seems to make no difference according to the explanation in the source below. But is it really so?

Source: http://www.java2s.com/Tutorial/Java/...beroftimes.htm

Many thanks in advance.