[datatable-help] replace a substring in a string

[derek]

Hello can you please tell me how to replace a string in another string at
exact position? 
For example:
The string:   "abc-abc-abc-bla-abc"

In the string I would like to replace substring "abc"
a) second occurrence of "abc" from the left of the string
b) first occurrence from the right of the string
c) all occurrences
d) replace first occurrence after 5th character

Thank you for your help in advance.




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