regex - Remove simple HTML-Tags from String in Oracle via RegExp, Explanation needed -

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i not understand, why columns reg1 , reg2 remove "bbb" string, , reg3 works expected. 

with t (select 'aaa <b>bbb</b> ccc' teststring dual)  select   teststring,   regexp_replace(teststring, '<.+>') reg1,   regexp_replace(teststring, '<.*>') reg2,   regexp_replace(teststring, '<.*?>') reg3 t   teststring             reg1        reg2          reg3 aaa <b>bbb</b> ccc     aaa ccc     aaa ccc       aaa bbb ccc

thanks lot!

because regex greedy default. i.e. expressions .* or .+ try take many characters possible. therefore <.+> span first < last >. make lazy using lazy operator ?:

regexp_replace(teststring, '<.+?>')

or

regexp_replace(teststring, '<.*?>')

now, search > stop @ first > encountered.

note . includes > well, therefore greedy variant (without ?) swallows > last.


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