I have this following string:
message_id = "[email protected]"
I would like to extract the last part between - .* @ which is 1661496224
With forward and backward lookup, it starts from first matches of - but I want to match from last match of -:
#!/bin/ruby
message_id = "[email protected]"
message_id.match(/(?<=\-).*(?=\@)
output:
#<MatchData "f97a-47b3-b42c-40868d2cef5b-1661496224">
How to capture the least match (1661496224) between two characters?
CodePudding user response：
You can match all the non-dash characters that are followed by a @:
[^-] (?=@)
Demo: 
CodePudding user response：
Assuming that the message_id does not contain spaces, you might use:
(?<=-)[^-@\s] (?=@)
If there can not be any more @ chars or hyphens after the @ till the end of the string, you can add that to the assertion.
(?<=-)[^-@\s] (?=@[^\s@-]*$)
Another option with a capture group:
-([^-@\s] )@[^-@\s]*$