Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
I'd have to say that it was not what I expected. I'm also surprised that this hasn't bitten me before. While I know theoretically that * can match empty strings, perl has always seemed to me to do the intuitive thing.

I guess I generally don't replace nothing with something. Usually when I use * I'm either just skipping over white space (or the moral equivalent), or I replace any pattern than has * in it with itself. That is, something like  s/A(.*)B/C${1}D/g;

Generally, I also try to constrain my patterns more, so I usually avoid constructs like ".*" or "*?", and would write something like s/A([^B]*)B/C${1}D/g;

The /s doesn't seem to have anything to do with it, except that, of course, you included a \n in your string. For example,

my $string = "aaab"; $string =~ s/a*/go/g;
Now string is "gogobgo".

In reply to Re: Regex Pop Quiz with .*, /g, and /s by Thelonius
in thread Regex Pop Quiz with .*, /g, and /s by saintmike

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 avoiding work at the Monastery: (2)
As of 2024-06-17 07:44 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?
    erzuuli‥ 🛈The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.