Perl 5 version 32.0 documentation

study

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage
  • study SCALAR

  • study

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    Prior to Perl version 5.16, it would create an inverted index of all characters that occurred in the given SCALAR (or $_ if unspecified). When matching a pattern, the rarest character from the pattern would be looked up in this index. Rarity was based on some static frequency tables constructed from some C programs and English text.