Integrity check should report year not consisting of 4 numerals

[grimes2]

Field year should consist of four numerals (year = {1986}). Other formats are allowed (year = {about 1986}), but should be reported by Check integrity.
EDIT: Because these formats are allowed, it should be not reported by Check integrity.

[Siedlerchr]

Yeah, but the official bibtex spec defines it a bit more detailed bibtex spec: http://ftp.fernuni-hagen.de/ftp-dir/pub/mirrors/www.ctan.org/biblio/bibtex/base/btxdoc.pdf

Generally it should consist of four numerals, such as 1984, although the stan-
dard styles can handle any year whose last four nonpunctuation characters are
numerals, such as ‘(about 1984)’.

[grimes2]

Interesting, but then this is not allowed: '(1984 but I am not sure)' or '(1984a)'

[grimes2]

My interpretation is: The Year Checker should check for "last nonpunctuation character should not be an alphabetic character". I would like to implement this.

[Siedlerchr]

You're welcome :) should be relatively simple to check if the last 4 chars of the field string are numeric.
Go for it 👍