Using REs

• match (m//) or substitutions (s///)

• operation/findPattern/replacePattern/options

• Popular options:

  • g Replace globally (s/// only).
  • i Ignore case
  • o Compile pattern only once.

• http://www.cascss.unt.edu/~tim/perl/retestfile.txt

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By default, // assumes "m".

Can use anything !! '' --symbolk of your choice.

Dissect: operation/find/replace/options

Popular options are:

g Replace globally, i.e., all occurrences (substitute only).

i Do case-insensitive pattern matching.

o Compile pattern only once.

The simplest regular expression: any string

perl -ne "print if m/start/;" testfile.txt