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Table 1 Regular expressions.

From: Analysing Twitter and web queries for flu trend prediction

Theme RegEx
Flu Cold Flu Symptoms (en)?grip[a-z]+ constip[a-z]+ (febre .* grau(s)?) | (grau(s)? .* febre) | ( bodypains .* febre) | (febre .* bodypains )
bodypains: do(r(es)?|i-me)\s*(no|na|de|o|a)?\s*(corpo|cabeca|garganta)
  1. Regular expressions used to filter influenza related tweets.