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Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

Name

grep

Synopsis

grep expr, list
grep {block} list
                  

Evaluates expr or blockin a Boolean context for each element of list, temporarily setting $_ to each element in turn. In list context, it returns a list of those elements for which the expression is true. Mostly used like Unix grep, in which expr is a search pattern, and list elements that match are returned. In scalar context, grep returns the number of times the expression was true.

For example, presuming @all_lines contains lines of code, this example weeds out comment lines:

@code_lines = grep !/^#/, @all_lines;
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Publisher Resources

ISBN: 0596002416Errata Page