Hi,
I would like to change a regular expression in a compatible way. Here is the use case. Initially, in the configuration I defined a reg-exp for validation of data before persisting it. Some data was created and persisted, later the reg-exp required a change, however, the change must be done is such a way that existing data should not become invalid.
Example: Initial validation says "no ; (semi-colon) and : (colon) in the text".
However, later we decide to relax the constraint and want to allow : (colon). By allowing this we are not invalidating any existing data and hence this change should be allowed. However, we should not be changing the configuration and add additional constraint, like now I don't want to allow _ (underscore) since there will be existing data that has _ (underscore).
I am using:
boost_1_46_1
Pseudo-code of APIs I am using:
#include