ruby - a regex for numbers, letters, and -_. but the -_. can't be last characters of the captured fragment -

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How do I create a regex that captures this form as: 

  "BS BN12 .3 .- "Scan (Reggae) # = & gt; [["12.3"]]

Where are the last time, underscore, and hyphen are not included in the capture, but are the internal ones? I tried the following: 

  "BS BN12.3." Scan (/ BN ([a-zA-Z0-9 \ -_.] +) /) #) = & Gt; If you create your existing group as a non-governmental organization, do it ? By terminating as  ([a-zA-Z0- 9 \ -_. >> +?)  as  and follow it with an expression that is different from the other  The letter  [-._] *  before ending with $ , you should do what you need: 
 
  "bs BN12.3.-" .scan (/ bn ([a-zA-Z0-9 \ -_.] +?) [-__ * * $ /) = & gt; [["12.3"]] # Various input string ... "BS BN12.3" .scan (/ BN ([a-zA-Z0-9 \ -_.] +?) [-._] * $ / ) = & Gt; [["12.3"]] 2.1.0: 012 & gt; "BS BN 12." Scan (/ BN ([A-GAA-Z-9-9. -_.] +?) [-__ * * $ /) => [["12"]] "BS BN 12.3-4.5 ______". Scan (/ BN ([A-GAA-Z. 0-9. -Y] +?) [-._] * $ /) = & gt; [["12.3-4.5"]  
 
 (Note: Most punctuation is not required to escape inside the  []  character class. Its current status 
 
 Appendix:  Any  non-alphabet, in order to prevent non-end characters To define, the last character class can be  [^ A-Za-z0- 9] *  
 
  "BS BN12.3-4.5 ______" .scan ( / BN ([a-zA-Z0-9 \ -_.] +?) [^ Azza-j 0-9] * $ /) = & gt; [["12.3-4.5"]

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