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Pattern substitute, pattern match and extract
Pattern matching example from a Well House Consultants training course
More on Pattern matching [link]
Source code: dls Module: U108
--[[ Removing punctation and getting a stream of names from a table ]] lineofdata = "Neil, Siobhan ... Robin & Tom" -- Replace each non-Alpha with a "-" cleaned = string.gsub(lineofdata,"%A","-"); print (cleaned) -- Replace all clumps of non-Alpha with a single space cleaned = string.gsub(lineofdata,"%A+"," "); print (cleaned) -- Reduce to individual name lineofdata = [[Neil, Jean-Pierre, Siobhan O'Brien ... Robin & Tom]] cleaned = string.gsub(lineofdata,"[^-a-zA-Z']+"," "); print (cleaned) -------------- Loops to extract all matches -------- names = "John Jones, Robin White, Thomas Tankengine" print ("\nFull name (forename, spaces, surname)") for fullname in string.gmatch(names,"%u%l+%s+%u%l+") do print (fullname) end print ("\nForename and surname into separate variables") for fore,sur in string.gmatch(names,"(%u%l+)%s+(%u%l+)") do print (sur .. ", " .. fore) end --[[ ----------------------- Sample Output [trainee@easterton gwh]$ lua dls Neil--Siobhan-----Robin---Tom Neil Siobhan Robin Tom Neil Jean-Pierre Siobhan O'Brien Robin Tom Full name (forename, spaces, surname) John Jones Robin White Thomas Tankengine Forename and surname into separate variables Jones, John White, Robin Tankengine, Thomas [trainee@easterton gwh]$ ]] Learn about this subject
This module and example are covered on the following public courses:
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Other Examples
This example comes from our "Pattern matching" training module. You'll find a description of the topic and some
other closely related examples on the "Pattern matching" module index page.
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