Repitition « Regular Expressions Functions « Oracle PL/SQL Tutorial

18.11.1.Repetition Operators
18.11.2.Looking for two consecutive vowels
18.11.3.Writing of the RE with a repeat operator: put in curly brackets {}.
18.11.4.A quantifier {m} matches exactly m repetitions
18.11.5.{m,n} where m,n specifies that the match should occur from m to n times
18.11.6.Three to five consecutive vowels
18.11.7.At least m times with: {m,}