[Solved] Perl Match Operator =~

Question

STRAIGHT OUTTA DOCS:

The simplest regexp is simply a word, or more generally, a string of
characters. A regexp consisting of a word matches any string that
contains that word:

"Hello World" =~ /World/;  # matches

What is this Perl statement all about? "Hello World" is a simple double-quoted string. World is
the regular expression and the // enclosing /World/ tells Perl to
search a string for a match. The operator =~ associates the string
with the regexp match and produces a true value if the regexp matched,
or false if the regexp did not match. In our case, World matches the
second word in "Hello World" , so the expression is true.

Please read http://perldoc.perl.org/perlretut.html

Now in your example "Johnson" =~ /son/ matches because RHS of =~ (which is son) is found in LHS (Johnson). In case of /son/ =~ "Johnson" RHS (Johnson) is not found in LHS (son).

Accepted Answer

STRAIGHT OUTTA DOCS:

The simplest regexp is simply a word, or more generally, a string of
characters. A regexp consisting of a word matches any string that
contains that word:

"Hello World" =~ /World/;  # matches

What is this Perl statement all about? "Hello World" is a simple double-quoted string. World is
the regular expression and the // enclosing /World/ tells Perl to
search a string for a match. The operator =~ associates the string
with the regexp match and produces a true value if the regexp matched,
or false if the regexp did not match. In our case, World matches the
second word in "Hello World" , so the expression is true.

Please read http://perldoc.perl.org/perlretut.html

Now in your example "Johnson" =~ /son/ matches because RHS of =~ (which is son) is found in LHS (Johnson). In case of /son/ =~ "Johnson" RHS (Johnson) is not found in LHS (son).