Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Grep could have been called "filter". But it is: "get regular expression".
Use grep when you think about getting a subset of an array.
use strict; use warnings; my @x = ("aaBxyz", "..Bxys", "bbxyzzy", "xxAx"); # for each element in the array @x, # pass that element to the array @result if # if the 3rd character is either A or B # followed by at least one character. my @result = grep {/^..(A|B)./}@x; print "$_\n" for @result; =prints aaBxyz ..Bxys xxAx =cut
Yes, in this case $1 will be either A or B if the regex is True.
I can show that, but I don't want to confuse you.
Here $1 is not relevant.

Ok, on second thought, here we go...

#ok, with a weird example of $1 @result = grep{ print "$1 $_\n" if /^..(A|B)./; /^..(A|B)./}@x; =prints B aaBxyz B ..Bxys A xxAx =cut @result is the same as above # grep {} executes the code within the brackets and passes the input # to @result depending upon the true/false value of the last statement +.

In reply to Re: do $n exist in grep? by Marshall
in thread do $n exist in grep? by misterperl

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (3)
As of 2021-09-21 08:56 GMT
Find Nodes?
    Voting Booth?

    No recent polls found