php - Regular expression to find a string included between two bars and containing certain words -

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After learning this I always forget the correct regex. I want to remove the ISBN number from the string.

string: english | ISBN: 1285463234. 2014 | 49 9 pages. PDF | 28 MB

Goal to remove: 1285463234

You can try the regex below to remove the ISBN number, 

  ISBN: \ s * \ K \ d +

Your PHP code will be, 

  & lt ;? Php $ mystring = 'english | ISBN: 1285463234. 2014 | 49 9 pages. PDF | 28 MB '; $ Regex = '~ ISBN: \ s * \ K \ d + ~'; If (preg_match ($ regex, $ mystring, $ m)) $ $ yourmatch = $ m [0]; Echo $ yourmatch; }? & Gt; // = & gt; 1285463234  Explanation:   
     
  •   ISBN:  string  ISBN:  
    •  
  •   \ s *  matches zero or more spaces. 
    •  
  •   \ k  discards previously matched characters (i.e.,  isbin: ) 
    •  
  •   \ d +  matches one or more digits. 
    •

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