Welcome to PerlMonks, randomhero1270! I think you did well on both your question and script...

Given your data set, consider the following:

use strict;
use warnings;

while ( my $protein = <DATA> ) {
    $protein =~ /([^:]+).+\s+([<=>]+)\s+/;
    print "$1 - $2\n";
}

__DATA__
R00005: 00330: C01010 => C00011
R00005: 00791: C01010 => C00011
R00005: 01100: C01010 <=> C00011
R00006: 00770: C00022 => C00900
R00008: 00362: C06033 => C00022
R00008: 00660: C00022 => C06033
R00010: 00500: C01083 => C00031
R00013: 00630: C00048 => C01146
R00013: 01100: C00048 <=> C01146

[download]

Output:

R00005 - =>
R00005 - =>
R00005 - <=>
R00006 - =>
R00008 - =>
R00008 - =>
R00010 - =>
R00013 - =>
R00013 - <=>

[download]

The regex:

/^([^:]+).+\s+([<=>]+)\s+/
 ^   ^    ^      ^
 |   |    |      |
 |   |    |      + - Capture characters from this class enclosed by 1+
+ spaces
 |   |    + - Keep going, matching any character except \n
 |   + - Capture characters that are not :
 + - Start at the beginning

[download]

The () notation creates captures. In this case $1 will contain the captured text, like R00008; $2 will contain the captured characters <, =, or >.

Hope this helps!

In reply to Re: Regex help by Kenosis
in thread Regex help by randomhero1270

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.