I'm trying to use regex to match any instance of two strings separated by |, but nothing more.

I've tried ^[^|] \|[^|]$, but I'm quite a beginner to regex and haven't been able to identify why it doesn't work.

Ex.

String 1|String 2

But the following should not match:

String 1|String 2|String 3  
String 1

CodePudding user response：

As Wiktor pointed out, your regex is missing a before the $. Actually the regex you have in your question would not match any of the above three inputs without either adding the or removing the $. Here would be the proper regex:

• 

  CodePudding user response：

  Use the pattern

  /^(?=.*\|)(?!.*\|.*\|).*$/gm
  

  The part (?=.*\|) says there is some (at least one) | present.

  The part (?!.*\|.*\|) says there are not 2 or more | present.

  Test your input here.