Is this the best way to use a regex and build a file?

Ruby
1

Hello,

I only have shallow knowledge of Ruby, and would like to check this is the best way to create a text file by reading items from another file through a regex:

header = "<?xml version=""1.0"" encoding=""UTF-8""?>\n<gpx>\n<trk>\n<name>RENAME ME</name>\n<trkseg>\n"
footer = "</trkseg>\n</trk>\n</gpx>\n"

File.open('test.gpx', 'w') do |file|
	file.puts header

	meat = File.read('input.gpx')
	meat.scan(/<trkpt.+?<\/trkpt>/m) { |mtch| 
	  file.puts mtch
	}
	
	file.puts footer
end

Thank you.

2

meat will be the contents of the entire file. If input.gpx is small, then it will be fine. Otherwise, you will want to process either by lines or by blocks.

3

But looks like the file is an XML file.

You should process it with an XML parser instead.

4

The ^ and $ characters mean “start” and “end” of the line, so they only match full lines consisting of one “word”. ^[a-zA-Z]S is similar, only the asterisk () means “no or any number of” the preceding character/group. The S is just an S and matches exactly one S.

5

I found much information from your post, thank you si much i love this forum.