| 1. | '.' matches anything | | |
| 2. | REGEXP_INSTR(description,'F.') | | |
| 3. | REGEXP_INSTR(description,'e.e'): Find a letter and then whatever until there was another of the same letter | | |
| 4. | REGEXP_INSTR(description,'i.i'): 'i' followed by any one character, followed by another 'i' | | |
| 5. | REGEXP_SUBSTR('Yababa dababa do','a.a') | | |
| 6. | REGEXP_SUBSTR('abbbb','ab+') | | |
| 7. | REGEXP_SUBSTR('a','ab+') | | |
| 8. | REGEXP_SUBSTR('abbbb','ab*') (2) | | |
| 9. | To see the difference between '*' and '+' | | |
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| 10. | '?': match exactly zero or one repetition | | |
| 11. | '+': match one or more repetitions | | |
| 12. | '*' (match zero or more repetitions) | | |
| 13. | REGEXP_INSTR(description, 'e.+e'): An 'e' followed by any number of other characters and then another 'e' | | |
| 14. | REGEXP_SUBSTR(description,'e.*e') | | |
| 15. | Use the non-greedy '?' | | |