Per your data set as it stands just now, here is an SSCCE:

use strict;
use warnings;

use Test::More tests => 1;

my @have = (
'99~Arun~Kumar~Mobilenum:
1234-567 , from Earth
Human',
'98~Mahesh~Babu~Mobilenum:
5678-901 , from Earth
Human'
);
my @want = (
'99~Arun~Kumar~Mobilenum: 1234-567 , from Earth Human',
'98~Mahesh~Babu~Mobilenum: 5678-901 , from Earth Human'
);

for (@have) {
    s/\n/ /sg;
}

is_deeply (\@have, \@want);

[download]

Since you haven't said what your input record separator is I have created the array by hand. See also How to ask better questions using Test::More and sample data.

In reply to Re: perl regex to match newline followed by number and text by hippo
in thread perl regex to match newline followed by number and text by arunkumarzz

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.