I have a table T with two columns C1 and C2.
I want to write a query as follows:
UPDATE TABLE T
SET C2 = REGEX_REPLACE(
"(REG_SUB_PART1)(REG_SUB_PART2)(REG_SUB_PART3)",
C1,
REG_SUB_PART1
)
WHERE C2="ABC";
Effectively, I want to use another column C1, let's say URL " http://www.google.com " and set C2 to be a part of it, let's say "google.com" using $3
(third part) of regex "(http://)?(www\\.)?([a-zA-Z0-9]*)"
.
As a result, C2 should be set as "google.com".
How could it be done using MySql?
PS: Please don't concentrate on specific regex.
There is no way to do regex capture groups in MySQL per http://dev.mysql.com/doc/refman/5.0/en/regexp.html . However, if you know the starting index in c1, an alternate way to accomplish a similar thing would be.
update t set c2= substring(c1,12) where c2 = 'abc';
This will get the substring 'google.com' from ' http://www.google.com ', provided that was the value in column c1.
Some other MySQL string functions that might come in handy are substring, substring_index and locate.
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