Re: On patterns and more

the =~ operator is part of a regular expression. One of the most powerful features I know. Check perlre, perlreref, perlrebackslash, perlrecharclass, perlreref, perlrequick or perlretut.

Comment on Re: On patterns and more

Replies are listed 'Best First'.
Re^2: On patterns and more by ikegami (Patriarch) on Mar 07, 2011 at 04:35 UTC
Not at all. It relates to the match, substitution and tr operators, not regular expressions. Some of those operators take a regular expression for argument, but that's unrelated to «`=~`». «`=~`» is the means by which one specifies the operand (argument) for some operators. `$x =~ m/.../ # Matches against $x $x =~ s/.../.../ # Modifies $x $x =~ tr/.../.../ # Modifies $x` [download] «`/.../`» is short for «`m/.../`». Operators that support «`=~`» default to using «`$_`» if «`=~`» isn't' used. For example, «`/.../`» is short for «`$_ =~ /.../`». The match operator is implied if the RHS of «`=~`» is an expression, so «`$x =~ "pat"`» means «`$x =~ /pat/`» and «`$x =~ $pat`» means «`$x =~ /$pat/`».	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^2: On patterns and more
by ikegami (Patriarch) on Mar 07, 2011 at 04:35 UTC

Not at all. It relates to the match, substitution and tr operators, not regular expressions. Some of those operators take a regular expression for argument, but that's unrelated to «=~».

«=~» is the means by which one specifies the operand (argument) for some operators.

$x =~ m/.../         # Matches against $x
$x =~ s/.../.../     # Modifies $x
$x =~ tr/.../.../    # Modifies $x
[download]

«/.../» is short for «m/.../».

Operators that support «=~» default to using «$_» if «=~» isn't' used. For example, «/.../» is short for «$_ =~ /.../».

The match operator is implied if the RHS of «=~» is an expression, so «$x =~ "pat"» means «$x =~ /pat/» and «$x =~ $pat» means «$x =~ /$pat/».

[reply]
[d/l]
[select]