Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
$re = "(?:$flags:$core)";

That doesn't work: too many  ':' (colons):

c:\@Work\Perl\monks>perl -wMstrict -le "my $string = '/.*uba$/i'; ;; my $flag = qr{ [msixpodual] }xms; ;; my $convertable = my ($core, $flags) = $string =~ m{ \A \s* / (.*?) / ($flag*) \z }xms; die qq{bad rx: '$string'} unless $convertable; ;; my $re = qq{(?:$flags:$core)}; print $re; print 'A: match' if 'uba' =~ $re; " (?:i:.*uba$)
Something like this works:
c:\@Work\Perl\monks>perl -wMstrict -le "my $string = '/.*u\/ba$/i'; ;; my $flag = qr{ [msixpodual] }xms; ;; my $convertable = my ($pattern, $modifiers) = $string =~ m{ \A \s* / (.*?) / ($flag*) \z }xms; die qq{bad rx: '$string'} unless $convertable; ;; my $rx = qr{(?$modifiers)$pattern}; print $rx; print 'A: match' if 'u/Ba' =~ $rx; ;; my $ry = qr{ \A foo $rx }xms; print $ry ;; print 'B: match' if 'foolubatU/bA' =~ $ry; print 'C: match' if 'FoolubatU/bA' =~ $ry; " (?^:(?i).*u\/ba$) A: match (?^msx: \A foo (?^:(?i).*u\/ba$) ) B: match
Note that:
  • I go directly to  qr// form.
  • The modifiers ($flag pattern) implemented vary by Perl version; see perlop.


Give a man a fish:  <%-{-{-{-<


In reply to Re^2: creating qr from existing regex by AnomalousMonk
in thread creating qr from existing regex by Bobert1234

Title:
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 How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others chanting in the Monastery: (5)
As of 2024-03-29 05:35 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found