Regular Expressions 101

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Regular Expression
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#### NEGATIONS #### #Busy \b( #wrapper (?:(?:from|is|i|am|at|on|it|do|to|for|a|make|the |that|day|time|month|exactly |call|meeting|lunch|breakfast|brunch)[ ])* (?: #negative words (?:busy|can'?t|can[ ]?n?ot|unavailable|except) #negated positive words |(?:not|)[ ] (?:be|)?[ ]? (?:available|free|around|do|able) ) #wrapper [ ]?(?:(?:from|is|i|am|at|on|it|do|to|for|a|make|the |that|day|time|month|exactly |call|meeting|lunch|breakfast|brunch)[ ])* #wrapper gets one free word (?:[ ]? (?:\S+) [ ]?)? #Repeat wrapper so free word can be anywhere in continuation [ ]?(?:(?:from|is|i|am|at|on|it|do|to|for|a|make|the |that|day|time|month|exactly |call|meeting|lunch|breakfast|brunch)[ ])* [ ]?(|then|at[ ]that[ ]time) | #∂ Busy #reverse the above after everything else #am doing|at X at|on | ( ( (\b(?:am|are|will[ ]be)\b[ ]) (at|on|doing|\S+ing|OOO|out[ ]of[ ]office)[ ] #"Have a" is a special case. Can't have "a" in the second group. # | (?:have|has)[ ](?:an?)[ ] #"Have a" also needs a negative lookahead for various false positives # (?! .* (?:free|open|clean?r?|fresh|blank|vacant|bare|naked) ) #8 Free words, no \s\r\n or ".!?" ) (?:[^.• !?\r\n]+[ ]){0,8} #may need to come back to the below, ?'d out for now (?:at|on)? ) (|then|at[ ]that[ ]time) #REVERSE EXCEPT: "I am busy Tomorrow Except for 3-5pm" #"I have a 3pm" ) #busy (and also ∂) - NO ALTERNATION [ ]? (?:(?:(?:and|maybe|also|aswell|as| [\.,?!:;] ) [ ])* ())? #SAVIOUR STRINGS: Noone says "we can do X" after valid dates.They might: "We can also do X" | #"a" can't be the first word (?!a) #match continous strings made up of 2 groups of words ((?:(?:we|could|how|i|a|is|it|am|be|do|can|you|would)[ ])+ ) ((?:(?:it|on|at|to|do|from |have|can|able|make|about|free|exactly|say|call|take|possible|meet)[ ])+ ) ()
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gmix

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Submitted by anonymous - 5 years ago