. Author manuscript; available in PMC: 2019 Nov 1.

Published in final edited form as: J Biomed Inform. 2018 Oct 4;87:68–78. doi: 10.1016/j.jbi.2018.10.001

Table 2.

Tweets are retrieved for the lexicon entry “cleft palate” if they match the combinations of text strings described by the regular expression.

Regular Expression	Sample Matches
r’\b(?:clefts\|cleff\|clefty\|clefted\|cleftee\|cleft\|clef)(?:\b(?:the\|this\|that\|these\|those \|a\|an\|his\|her\|of\|and\|(?:w/\|with\|w)\|their\|between\|in\|on\|under\|both)\b\|\W)*(?: palate\|pallettes\|palats\|pallate\|palat\|pallet\|pallats\|pallatt\|palet\|palates \|pallete\|palets\|pallat\|paletes\|pallett\|pallates\|pallets\|palete\|pallattes\|pallatts\|palletes \|pallette\|palletts\|pallatte)’	Cleft Palate, cleft on her palate cleft-palate #cleftpalate #CleftPalateAwareness