Wild Card « Regular Expressions « Oracle PL / SQL

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Oracle PL / SQL » Regular Expressions » Wild Card 
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 '+'
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 '?'
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