Quote:
Originally Posted by Tanjamuse
What's the difference between "Has" and "Has Pattern"?
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"Has" requires that the value in the column (or a sub-value if the column is tags-like) equal the value in the rule. It is equivalent to the search operator "=", e.g., tags:=something.
"Has Pattern" requires that the value in the column match the regular expression in the rule. Depending on the regexp the match can be total or partial. For example, the pattern "ha" will match the value "thank". The pattern "^ha" will match "happens" but will not match "thank". It is equivalent to the search operator "~", e.g., tags:~pat.
The calibre manual section
The Search Interface might help differentiate between the two.