在MySQL中使用replace和concat

Question

I have strings values such as the following in a column:

|333|,|331|

I want to perform a balanced string replacement as follows:

xxTM_333_TMxx,xxTM_331_TMxx

I have tried to do this with the REPLACE and CONCAT functions but didn't get the desired output.

For example:

SELECT REPLACE('|333|,|331|','|','xxTM');

This replaces one of the | symbols correctly in each case, but not its matched (balanced) counterpart.

How can I achieve this result in MySQL?

Answer 1

SET @st := '|333|,|331|';

SELECT
  CASE WHEN @st LIKE '|%|' THEN
    CONCAT(
      'xxTM',
      REPLACE(REPLACE(@st, '|,|', '_TMxx,xxTM_'), '|', '_'),
      'TMxx')
  END rep_st;

Please see fiddle here .