Trying to utilize Javascript’s String.prototype.replace() function in Snowflake, because apparently Snowflake’s regex_replace
function lacks certain features such ast (forward/backward) look arounds.
Here is my Javascript UDF attempt:
CREATE OR REPLACE FUNCTION REXP_REPLACE_ME(subject TEXT, pattern TEXT, replacement TEXT) RETURNS string LANGUAGE JAVASCRIPT AS $$ const p = SUBJECT; const regex = PATTERN; return p.replace(regex, REPLACEMENT); $$ ;
However, when I try to execute using the example provided in the string.prototype.replace()
documentation linked above. I’m not getting the expected result:
SELECT REXP_REPLACE_ME('The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?', '/Dog/i', 'cat') //expected output: 'The quick brown fox jumps over the lazy ferret. If the cat reacted, was it really lazy?' //actual output: 'The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?'
Any ideas?
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Answer
because in Javascript the regex is not string lateral, it is it’s own thing.
> a = 'The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?'; 'The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?' > b = a.replace('/Dog/i', 'cat'); 'The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?' > b = a.replace(/Dog/i, 'cat'); 'The quick brown fox jumps over the lazy ferret. If the cat reacted, was it really lazy?' >