Table 2.

Step-by-step interpretation of the Age + gravida/para pattern.

Java regular expression component	Translation (meaning of the regular expression component => translation in context of age + gravida/para status)	Example 1: 32-yo G1 now P2	Example 2: 24 years old gravida IV para I now II
(\\d{2})	Exactly 2 numbers => maternal age digits	32	24
\\W* (only defined in this table once for brevity)	(Same translation for every instance of \\W*) Non-letter/underscore => a space or punctuation separating the other age components	-
[yearhs]*	Any 0 or more of the letters in the brackets => representation of the word “year” in the maternal age (e.g., “year” or the “y” part of “yo”); the extra h is not a typo in the pattern but rather represents a typo in the note text that we wanted to capture	y	years
[oldp]*	Any 0 or more letters in the brackets => representation of the word “old” in the maternal age (e.g., “old” or the “o” part of “yo”); again, the extra p is a typo in the note text that we want to capture	o	old
(Gravida|gravida|G| primparous|primiparous| primigravida| multiparous|primip)	Any of the terms separated by the vertical bar => representation of “gravida” (the number of pregnancies to date), “primiparous” (having one live birth), or “multiparous” (having more than one live birth)	G	gravida
[0–9IVX]*	Any of the digits 0–9 or upper case letters I, V or X => representation of the gravida value, either with Arabic or Roman numerals	1	IV
(now)*	The word “now” => indicates the change in para information from before the current delivery to after the current delivery	now
(para|Para|P|p)*	Any of the terms separated by the vertical bar => representation of “para” (i.e., the number of live births)	P	para
([0–9IVX]*)	See above	2	I
(now)*	See above		now
([0–9IVX]*)	See above		II

A star (*) in the pattern means that the pattern can occur 0 or more times. We had to account for 0 occurrences because every note was missing at least one component of the pattern.