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iterating through a string, choosing a pattern
Pattern matching example from a Well House Consultants training course
More on Pattern matching [link]

This example is described in the following article(s):
   • Lua Regular Expressions - [link]

Source code: patplode Module: U108

--[[
Here are some examples of how you can iterate through a
string collecting the sections that match a particular pattern
]]


print ("\niterating through the words in a string")
stuff = "to iterate through this, we match at ... punctuation!"
for k in string.gmatch(stuff,'%w+') do
        print (k)
        end

print ("\nAlternative - capturing non-spaces")
for k in string.gmatch(stuff,'%S+') do
        print (k)
        end

print ("\nCapture a char, then greedy to last repeat of it")
for k,j,l in string.gmatch(stuff,'(.)(.*)(%1)') do
        print (k,j,l)
        end

print ("\nCapture a char, then sparse to last repeat of it")
for k,j,l in string.gmatch(stuff,'(.)(.-)(%1)') do
        print (k,j,l)
        end

print ("\n6 chars at a time, 2 to one variable and 4 to another")
for k,j in string.gmatch(stuff,'(..)(....)') do
        print (k,j)
        end

print ("\niterating through the parameters to a CGI script")
cgistring = 'this=17&that=24&somemore=extra text'
for k3,k4 in string.gmatch(cgistring,'([^=&]+)=([^&]+)') do
        print (k3,k4)
        end

--[[ ------------------ Sample output -------------------
[trainee@easterton u108]$ lua patplode

iterating through the words in a string
to
iterate
through
this
we
match
at
punctuation

Alternative - capturing non-spaces
to
iterate
through
this,
we
match
at
...
punctuation!

Capture a char, then greedy to last repeat of it
t o iterate through this, we match at ... punctua t

Capture a char, then sparse to last repeat of it
t o i t
e rat e
        through
t his, we ma t
c h at ... pun c
t ua t

6 chars at a time, 2 to one variable and 4 to another
to
 i tera
te thr
ou gh t
hi s, w
e matc
h at .
.. pun
ct uati

iterating through the parameters to a CGI script
this 17
that 24
somemore extra text
[trainee@easterton u108]$

]]


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
 * Lua Programming
Also available on on site courses for larger groups

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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.

Full description of the source code
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