You need to escape the brackets otherwise they have a special meaning (character classes) in regex syntax.

Either you write $find='...\[...\]' or you use \Q for quoting s/\Q$find/.../.

  DB<114> $_='abc[de]'
 => "abc[de]"
 
  DB<115> $find='c[de]'
 => "c[de]"
 
  DB<116> $find2='c\[de\]'
 => "c\\[de\\]"
 
  DB<117> m/$find/             # no match
  DB<118> m/$find2/            # match
 => 1
  DB<119> m/\Q$find/           # match
 => 1
  DB<120> "\Q$find"            # how \Q=quotemeta works
 => "c\\[de\\]"

[download]

Cheers Rolf

In reply to Re: How to replace a piece of text containing brackets in an external file by LanX
in thread How to replace a piece of text containing brackets in an external file by cre8tor

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