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I would to like to replace a letter in a string by position in big query. for example XXXXX, YYYYY, ZZZZZ the 5th letter in the string to 0 I've tried to use the Stuff function, but big query doesn't find the function Stuff(XXXXX, 5, 1, '0')

Shany H.
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2 Answers2

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Probably the simplest method is more basic string operations:

select concat(substr(x, 1, 4), '0', substr(x, 6))
Gordon Linoff
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Below is for BigQuery Standard SQL and Legacy SQL (works for both) 

SELECT REGEXP_REPLACE(str, r'(.{4}).(.*)', r'\10\2')
Mikhail Berlyant
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