postgresql - How to convert a word in regex uppercase and lowercase? -

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i working postgres db , need convert text regex accepts uppercase , lowercase in letter, example:

transform palaver "word" in [ww] [oo] [rr] [dd]

i trying unsuccessfully command:

select regexp_replace ('word', '[a-za-z]', '[ww]', 'gi');

i not bother adding character classes per each letter, , use inline modifier (?i):

select regexp_replace ('word', '^', '(?i)');

see sqlfiddle


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