MySQL：如何在字符串的开头搜索和替换字符

Question

I'm trying to search and replace mobile numbers with the full international code. So where rows have 07970000007 to replace the beginning with +447970000007

UPDATE tblMemberImportClub 
SET msisdn = REPLACE(msisdn, '07', '+447') 
WHERE INSTR(msisdn, '07') = 1;

But this also replaces the other matches:

+4479700000+447

I don't think i can use TRIM as some rows will already start with +447 and will therefore nor require any updates.

Thanks in advance for any assistance.

Answer 1

Use LIKE and INSERT() :

UPDATE tblMemberImportClub 
    SET msisdn = INSERT(msisdn, 1, 2, '+447') 
    WHERE msisdn LIKE '07%';

INSERT() is a string function that replaces exactly the characters you specify (see here ).

Answer 2

SELECT  

CONCAT(
                   REPLACE(
                             LEFT('07970000007',2), '07', '+447'
                   ),      
                   SUBSTRING('07970000007', 3, CHAR_LENGTH('07970000007'))
       )as replaced