(?:      non-capturing parentheses
      ^    start of string
       |   or
      \|   pipe character
   )

[download]
   (?=     look-ahead, not part of match
       $   end of string
        |  or
       \|  pipe character
    )

[download]

So I am looking for something between the start of string or a pipe and a pipe or the end of the string, ignoring whitespace, matching non-greedily. In order to make it work, I need to use each pipe twice, once for the string before the pipe, and then for the string following it. Thus the look-ahead assertion. HTH.

In reply to Re^3: How to clean an array of strings after a split by hdb
in thread How to clean an array of strings after a split by MrSnrub

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