The code gist below outlines how to add search functionality for a specific user field or custom user meta field.
To search on a specific meta key, enter the query as follows: field_name:field_value. For example, if you have a user meta field “job_title” and want to search for the value “accountant”, enter job_title:accountant or to find all members with billing addresses in the state of Pennsylvania, search for pmpro_bstate:pa.
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