regex - Oracle regular expression replacement for negative lookahead/lookbehind that doesn't consume a character -

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i'm looking better answer similar problem post "oracle regular expression replacement negative lookahead/lookbehind"

my problem find numbers of 8 digit coming after keyword.

  must match:  ref12345678  ref:12345678  ref text or short 23 num 12345678  
  not match: ref 123456789 ref 123456789  
  '(ref)(.*?)(\d{8})(\w|$)'; # matches 9 digits: ref 123456789 '(ref)(.*?)\d(\d{8})(\w|$)'; # won't match ref12345678

\d suggested solution in existing post way avoid .*? matching 1st digit of 9, if there no non-digits left won't work. (in ref12345678 f in ref used already).

  '(ref)(.*?)(?<!\d)(\d{8})(\w|$)'

works wonderfully in perl, not oracle, doesn't support negative lookbehind.

how can zero-width assertion either non-digit comes before number, or .* did not end digit? (using \d? won't work.)

any suggestions please?

i think you're looking for:

(ref)(.*?\d)?(\d{8})(\w|$)

this says, if there characters between ref , 8 digits, last 1 must non-digit.


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