regex to match "---" followed by new line

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello PerlMonks who are always smarter than me. I'm trying to write a regex to match "---" followed by a new line to parse a number of files and return some data with no success. Here's the code that I have that's not working , any assistance is greatly appreciated.

 @matches7 = ($text =~  /(.{0,0})\K(---\s*)(.{0,200})/gisx);
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Re: regex to match "---" followed by new line by haukex (Archbishop) on Jun 29, 2017 at 07:27 UTC
Your regex does seem to do something for me... but what does your `$text` contain? If you're reading it from a file, are you reading the file line-by-line or are you slurping it all at once? There are several things I could point out about the regex, like how I'm not sure what `(.{0,0})\K` is supposed to be doing, or that the dots `.` will match anything, including newlines (because of `/s`) and dashes. But reviewing the regex doesn't make much sense without knowing what it's supposed to match against - please provide an SSCCE with several examples of what should match and what shouldn't! `use Data::Dump; dd "---\nFoo\n---\nBar\n" =~ /(.{0,0})\K(---\s*)(.{0,200})/gisx; __END__ ("", "---\n", "Foo\n---\nBar\n")` [download] Also, note that you could set the input record separator $/ to something like `"---\n"` to read a file in chunks separated by that string.	[reply] [d/l] [select]
Re: regex to match "---" followed by new line by 1nickt (Canon) on Jun 29, 2017 at 08:07 UTC
Hi, you're not really using a regexp to parse a YAML document, are you? The way forward always starts with a minimal test.	[reply]
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