Okay. No one actually explains why your regex doesn't work, so I will take a stab at it.

1) If you want to do a substitution the form is $post =~ s/matching bit/replacement bits/modifier bits; (note the s instead of the m- s is for substitute, m is for match)

2) When you start a matching expression with ^ it will match the beginning of the line. $ is for the end of the line. Neither of these are necessary to match a new line character, really. Since the character you are looking for defines where lines begin and end.

3) You probably want to put a modifier or two at the end of your expression to make sure that you match and substitute all of the \n's in your $post. I suggest /sg. Adding s will make the RE treat your entire $post as one string. Adding g will make the RE test and match until it can't find anymore matches-- otherwise it will only match/substitute once.

So just to clarify, I suggest using $post =~ s/\n/<br>/sg; . And don't be afraid to read the regex docs at perldoc perlre.

In reply to (ichimunki) Re: Replace new line char with br by ichimunki
in thread Replace new line char with br by HTTP-404

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


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.