STORY: Punctuation normalization - Special treatment of trailing periods

This card extends punctuation normalization rules covered in

• https://folio-org.atlassian.net/browse/MODLD-619, and

• https://folio-org.atlassian.net/browse/MODLD-634

And adds an additional rule affecting trailing periods.

Currently, the punctuation normalization rules state that trailing periods should be stripped when present at the end of a subfield all things equal. However, there are exceptions to the rule which are covered in this card.

When a punctuation normalization rule involves a period mark (.), and the preceding subfield has a trailing period, the value of the subfield needs to be inspected before stripping the trailing period.

Specifically, the last three characters of the preceding subfield must checked to see if they match either of two patterns:

Pattern 1: <space><uppercase letter><period>, e.g. 100 $a Rees, Paul A.

Pattern 2: <period><uppercase letter><period> e.g. 100 $a Kerrigan, Nancy W.K.

If either pattern is present, retain the period mark. Else strip the trailing period from the subfield.

Essentially, the pattern test checks to see if the value of the subfield ends with initials (say, for a person’s name). That use case for punctuation is important for identification.

Other use cases, e.g. trailing punctuation of a date (2015.) do not fit either pattern, and should be removed from the value of the subfield.