Take out string from "<string>" in Lua

Question

I want to parse some data from a string in Lua. I have tried several combination of string.match and string.sub but no luck. Here is the detail...

str='[{id:78749,name:Hrithik Roshan,character:Vijay Deenanath Chauhan,order:0,cast_id:1,profile_path:/1uGhDRNCA9I4WvyD9TfgKYnLEhZ.jpg},{id:77234,name:Priyanka Chopra,character:Kaali Gawde,ord'

fixstr = string.gsub(str,"name:","<actors>")
fixstr = string.gsub(fixstr,"character:","<actors>")
print(fixstr)
fixstr1 = string.match( fixstr, "<actors>(.+)<actors>")
print(fixstr1)

Output:

Output of rint(fixstr)

[{id:78749,<actors>Hrithik Roshan,<actors>Vijay Deenanath Chauhan,order:0,cast_id:1,profile_path:/1uGhDRNCA9I4WvyD9TfgKYnLEhZ.jpg},{id:77234,<actors>Priyanka Chopra,<actors>Kaali Gawde,ord

Output of print(fixstr1)

Hrithik Roshan,<actors>Vijay Deenanath Chauhan,order:0,cast_id:1,profile_path:/1uGhDRNCA9I4WvyD9TfgKYnLEhZ.jpg},{id:77234,<actors>Priyanka Chopra,

What I am trying to do is get all the string between <actors>...<actors> but it didn't worked. Can anybody help on this?

Yu Hao · Accepted Answer · 2013-12-12 05:36:02Z

3

To get all the strings between <actors> and <actors>, use string.gmatch for global match:

for name in string.gmatch(fixstr, "<actors>(.-)<actors>") do
    print(name)
end

Note the use of .- in which - matches zero or more occurrences, but it's non-greedy.

Output:

Hrithik Roshan,
Priyanka Chopra,

Actually, unless you need fixstr for other uses, you don't need to substitute name: and character: to <actors>, just one run of string.gmatch can do the job:

for name in string.gmatch(str, "name:(.-)character:") do
    print(name)
end

edited Dec 12, 2013 at 5:36

answered Dec 12, 2013 at 5:30

Yu Hao

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3 Comments

Prakash.DTI Over a year ago

Thanks it worked like charm. But becouse its in loop it will give output in new line every time it runs i want it in single string like .....Hrithik Roshan,Priyanka Chopra,Sanjay Dutt,Rishi Kapoor,Zarina Wahab,Om Puri,

Yu Hao Over a year ago

@user1640175 The new line is added by print. You can initialize an empty string result = "" and concatenate the names to it in the loop result = result .. name.

lhf Over a year ago

@user1640175, you can also use io.write(name,' ') instead of print.

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