The g Modifier Global Substitution : modifier « Regular Expression « Perl






  1. Perl
  2. Regular Expression
  3. modifier

The g Modifier Global Substitution

    

#Format: s/search pattern/replacement string/g;


# Without the g option
while(<DATA>){
     print if s/Tom/Jack/;  # First occurrence of Tom on each line is replaced with Jack
}
__DATA__
    Tom Dave Dan Tom
    Betty Tom Henry Tom
    Jack Norma Tom Tom

# With the g option
while(<DATA>){
     print if s/Tom/Jack/g;  # All occurrences of Tom on each line are replaced with Jack
}
__DATA__
    Tom Dave Dan Tom
    Betty Tom Henry Tom
    Igor Norma Tom Tom








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