Pattern Matching Operators : Pattern matching « Regular Expression « Perl






  1. Perl
  2. Regular Expression
  3. Pattern matching

Pattern Matching Operators

    
#Example                        Meaning
#$name =~ /Tom/                 True if $name contains pattern. 
#                               Returns 1 for true, null for false.
#$name !~ /Jack/                True if $name does not contain pattern.
#$name =~ s/Jack/Sam/           Replace first occurrence of John with Sam.
#$name =~ s/Jack/Sam/g          Replace all occurrences of John with Sam.
#$name =~ tr/a-z/A-Z/           Translate all lowercase letters to uppercase.
#$name =~ /$pal/                A variable can be used in the search string.


# Using the $_ scalar explicitly
while($_=<DATA>){
    print $_ if $_ =~ /I/;  # $_ holds the current input line
#   print if /I/;
}
__DATA__
    S
    B
    I
    N
    J
    K








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11.Regular expression character patterns
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15.Regular expression: start a string with period
16.Reversing subpatterns
17.Repeating patterns
18.Check for 'a'
19.Check for 4-8 a's
20.Check for a or b
21.Check for and remove a trailing backslash character
22.Check for leading alpha character, rest alphanumeric
23.Check for no 'a'
24.Check for white space
25.A program that illustrates the use of the matching operator.
26./d.f/ matches d, followed by any non-newline character, followed by f
27./de{1,3}f/ matches d, followed by one, two, or three occurrences of e, followed by f.
28.Print line unless it matches E
29.Count the match times