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[event sanitization] Add a "mask" functionality to purge string fields
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It would be interesting to be able to sanitize string fields by using a mask.
For instance, if we want to transform a full URL to a hostname:

to a more privacy-aware truncated url like:

Another example could be an identifier composed of:


This one could be masked to i.e. not contain the detail:


In addition to that, it could solve T279952.