{n} or {m,n} notation provides a more general way of writing regular expressions: {1}, {2,3} : Occurrences « Regular Expressions « MySQL Tutorial






  1. MySQL Tutorial
  2. Regular Expressions
  3. Occurrences

{n} or {m,n} notation matches many occurrences of the previous atom (or "piece") of the pattern.

m and n are integers.

  1. a*: Can be written as a{0,}.
  2. a+: Can be written as a{1,}.
  3. a?: Can be written as a{0,1}.
  4. a{n} matches exactly n instances of a.
  5. a{n,} matches n or more instances of a.
  6. a{m,n} matches m through n instances of a, inclusive.

m and n must be in the range from 0 to RE_DUP_MAX (default 255), inclusive.

If both m and n are given, m must be less than or equal to n.

mysql>
mysql> SELECT 'abcde' REGEXP 'a[bcd]{2}e';
+-----------------------------+
| 'abcde' REGEXP 'a[bcd]{2}e' |
+-----------------------------+
|                           0 |
+-----------------------------+
1 row in set (0.01 sec)








24.8.Occurrences
24.8.1.{n} or {m,n} notation provides a more general way of writing regular expressions: {1}, {2,3}
24.8.2.SELECT 'abcde' REGEXP 'a[bcd]{3}e';
24.8.3.SELECT 'abcde' REGEXP 'a[bcd]{1,10}e';