regexlinuxunixsed

Replace digits using sed

I want all digits after a equal sign in a given string to be replaced with the text 'NULL'. I am new to using sed. How do I get the desired output using sed?

Example 1:

Input: /getProduct?productId=1234&quanity=4  
Output: /getProduct?productId=NULL&quantity=NULL

Example 2:

Input: /getCustomers?customerId=432  
Output: /getCustomers?customerId=NULL

Thank you.

Solution

  • Using sed -r 's/(=)([0-9]+)/\1NULL/g' inputfile.txt on inputfile:

    /getProduct?productId=1234&quanity=4
/getCustomers?customerId=432
/getCustomers3?customerId=432

    we get:

    /getProduct?productId=NULL&quanity=NULL
/getCustomers?customerId=NULL
/getCustomers3?customerId=NULL

    Only digits appearing after the equal sign are changed.