How do I match a character in Perl?
m operator in Perl is used to match a pattern within the given text. The string passed to m operator can be enclosed within any character which will be used as a delimiter to regular expressions.
What are boundary characters in Perl?
A word boundary ( \b ) is a spot between two characters that has a \w on one side of it and a \W on the other side of it (in either order), counting the imaginary characters off the beginning and end of the string as matching a \W .
How do I replace a character in a string in Perl?
In Perl tr is the transliterator tool that can replace characters by other characters pair-wise….tr looks very similar to the substitution operator, but it behaves in a different way:
- use strict;
- use warnings;
- use 5.010;
- my $text = ‘abc bad acdf’;
- say $text;
- $text =~ tr/a/z/;
- say $text;
What are metacharacters in Perl?
The metacharacters in this table contain a question mark as the first element inside the parentheses. The characters after the question mark indicate the extension. specifies a comment in which the text is ignored. specifies one or more embedded pattern-matching modifiers.
How do I match an exact string in Perl?
- use \A and \z , not ^ and $ , or you will match other strings too (e.g. “yes\n” ) – ysth. Feb 5, 2013 at 4:32.
- @ysth, this is matching on a single line from STDIN . Multi-line input will not occur. – user1919238. Feb 5, 2013 at 10:54.
How do you use metacharacters?
A metacharacter is a character that has a special meaning during pattern processing. You use metacharacters in regular expressions to define the search criteria and any text manipulations….Search string metacharacters.
| Metacharacter | Action |
|---|---|
| * | Match zero, one, or many of the preceding expression. |