How do I print a backslash in Perl?
If we want to print (\) sign inside a string, use backward slash (\) preceding \ sign.
- use strict;
- use warnings;
- print “The \\n is a new line chracter in programming languages.\n”;
How do you match a backslash in Perl?
Note that the backslash itself is special; if you want to match a backslash, you have to escape the backslash with a backslash: /\\/ matches a single backslash.
How do I use special characters in Perl?
The Special Character Classes in Perl are as follows: Digit \d[0-9]: The \d is used to match any digit character and its equivalent to [0-9]….Perl | Special Character Classes in Regular Expressions.
| Class | Description |
|---|---|
| alpha | Any alphabetical character (“[A-Za-z]”) |
| alnum | Any alphanumeric character (“[A-Za-z0-9]”). |
| ascii | Any character in the ASCII character set. |
What is Quotemeta in Perl?
Perl | quotemeta() Function quotemeta() function in Perl escapes all meta-characters in the value passed to it as parameter. Example: Input : “GF*..G” Output : “GF\*\.\.G” Syntax: quotemeta(value)
Do I need to escape in Perl?
Displaying email address in Perl In case of single quotes no need to use the the escape sequence because interpolation doesn’t happen in single quote strings.
What is Quotemeta?
quotemeta EXPR quotemeta. Returns the value of EXPR with all the ASCII non-“word” characters backslashed. (That is, all ASCII characters not matching /[A-Za-z_0-9]/ will be preceded by a backslash in the returned string, regardless of any locale settings.)
What does a backslash sequence mean in Perl?
A backslash sequence is a sequence of characters, the first one of which is a backslash. Perl ascribes special meaning to many such sequences, and some of these are character classes. That is, they match a single character each, provided that the character belongs to the specific set of characters defined by the sequence.
What does the backslash do in a regular expression?
In a regular expression, the backslash can perform one of two tasks: it either takes away the special meaning of the character following it (for instance, \\| matches a vertical bar, it’s not an alternation), or it is the start of a backslash or escape sequence.
What are the different character classes in Perl?
There are three types of character classes in Perl regular expressions: the dot, backslash sequences, and the form enclosed in square brackets. Keep in mind, though, that often the term “character class” is used to mean just the bracketed form.
Is it safe to put a backslash in front of a non word character?
So it is safe to put a backslash in front of a non-word character. Note that the backslash itself is special; if you want to match a backslash, you have to escape the backslash with a backslash: /\\\\/ matches a single backslash.