qc_email_check function checks for correctness in the email fields
Data frame containing the site metadata where email variables are located.
Provided email direction/s (contact and additional contributor, if any) are checked to ensure that are valid email directions. This function uses stringr package utilities for character string tinkering and regex to match the characteristics of email directions
A data frame with the directions and the result of the check
Email directions can be divided in three components,
username component can contain
any letter, number, underscores, dots and hyphens.
can be also any letter, number, underscores dots and hyphens, followed by
a dot and from two to six letters and/or dots. So, the regex expression
to match a email direction is as follows:
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