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- Subject: gmatch problem
- From: "John Logsdon" <j.logsdon@...>
- Date: Thu, 30 Mar 2017 13:43:59 +0100
I have a regex problem in 5.2.4 either under Cygwin or Ubuntu 16.04.
I want to match two character strings like Aa, AA, A2 where the first
letter is a capital and the second could also be a digit using
string.gmatch to generate an iterator.
If I check with string.match this works:
print(string.match("blah blah Aa boo ","%u%w"))
print(string.match("blah blah AA boo ","%u%w"))
print(string.match("blah blah A3 boo ","%u%w"))
But if I use gmatch as in a simple function:
local str=" A1 blah AA boo Ax "
local function getCase(A,str)
local nextCase = string.gmatch(str,"%u%w")
while N ~= nil do
if type(Q[N]) == 'table' then A[N] = #Q[N] end
The function takes a table and checks whether Q[A3] for example exists and
is a table, if so, returning the length of the table in A.
I have added print instructions but the iterator does not find the cases
where there is a number involved.
I have tried all sorts of regexes: %u%w, %u[%a%d], %u[a-zA-Z0-9] all to
no avail. I cannot detect the cases where there is a digit.
Any clues what I am doing wrong, when string.match will detect the string
correctly. Is there a problem with string.gmatch?
I could of course use string.find (which also works correctly) starting
with the end (or 1) to get round the issue but that is rather inelegant :(
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