mysql - replace string inside the table sql -

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I have a problem about replacing the string in mysql table with some requirement. You can view my current table: 

  + ---- + ------------------------ + | ID | Data | + ---- + ------------------------ + | 1 | [Lesson 1] MyText 1 [/ lesson 1] | | | [Text2] MyText 2 [/ Lesson 2] | | | [Lesson 3] MyText 3 [/ Lesson 3] | | | [Text4] mytext4 [/ text4] | | + ---- + ------------------------ +   
 then change me to  The problem is: [ 3] [text3] mytext3 [/ text3]  [text3] mytext5 [/ text3]   
 and the problem is:  
     < Li> How can I change the content between [textX] and [/ textX]?   
     Any ideas?   
     
     
     Like to search for hit, then change to change:  
     mytable set data = (data, 'mytext3', 'mytext5'), where '[text%] mytext 3 [/ text%]' data such as

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