- 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
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