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Need help with regexp

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Posted by Gunner   Argentina  (31 posts)  [Biography] bio
Date Tue 30 Mar 2021 03:51 AM (UTC)

Amended on Tue 30 Mar 2021 04:48 AM (UTC) by Nick Gammon

Message
Hello.
I am trying to validate text input from an input box.
What I need is for the character string to match a word (not numbers) or two words separated by a space
the function is:


function comprobar_hechizo (dhech)
  local match = string.match (dhech, "^%%a+%%s%%a+$")
  if not n then
    utils.msgbox ("the spell name can only contain letters and spaces", "Error")
  return false
  end
return true
end


This only works if the string contains two words and a space, but I also want it to work if the string contains only one word.
I have tried this:


  local match = string.match (dhech, "^%%a+|%%a+%%s%%a+$")


But don't work.
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Posted by Nick Gammon   Australia  (23,006 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Tue 30 Mar 2021 04:35 AM (UTC)
Message
What's with the two % symbols?

Anyway, Lua patterns don't have optional things (however the PCRE regexps, used in triggers, do).

You could do this:


test = "foo bar"

if string.match (test, "^[%a%s]+$") then
  print "ok"
else
  print "fail"
end


That will test for letters and spaces, so it would match one word, two words, three or more words, or even a single space.

A better thing would be to have two tests (one word, or two words) like this:


test = "foo bar"

if string.match (test, "^%a+$") or string.match (test, "^%a+%s+%a+$") then
  print "ok"
else
  print "fail"
end

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Nick Gammon   Australia  (23,006 posts)  [Biography] bio   Forum Administrator
Date Reply #2 on Tue 30 Mar 2021 04:40 AM (UTC)

Amended on Tue 30 Mar 2021 04:41 AM (UTC) by Nick Gammon

Message
Although this might work:


test = "foo bar"

if string.match (test, "^%a+%s*%a*$") then
  print "ok"
else
  print "fail"
end


That is testing for:


  • One or more letters (so you get at least one word)
  • Zero or more spaces (so the space is optional)
  • Zero or more extra letters (to allow for the second word)


See: http://www.gammon.com.au/scripts/doc.php?lua=string.find

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Gunner   Argentina  (31 posts)  [Biography] bio
Date Reply #3 on Tue 30 Mar 2021 04:52 AM (UTC)
Message
Nick Gammon said:

A better thing would be to have two tests (one word, or two words) like this:


test = "foo bar"

if string.match (test, "^%a+$") or string.match (test, "^%a+%s+%a+$") then
  print "ok"
else
  print "fail"
end



Perfect, that has worked for me.
As for the double%, that function is inside a send in an alias
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