Matching repetitions

From Augix' Wiki

• a? = match 'a' 1 or 0 times

• a* = match 'a' 0 or more times, i.e., any number of times

• a+ = match 'a' 1 or more times, i.e., at least once

• a{n,m} = match at least n times, but not more than m times.

• a{n,} = match at least n or more times

• a{n} = match exactly n times