I'm confused with a negative lookahead. Here's some example code. I want it to match on $needs and to not match on $has. The examples 3 and 4 are only as a reference to a fixed string, but I basically want ^($start(.*?))(?!$end)$. Any ideas?
my $start = "log4j.rootLogger=";
my $startlong = "log4j.rootLogger=INFO, FILE";
my $end = ", SYSLOG";
my $needs = 'log4j.rootLogger=INFO, FILE';
my $has = $needs . ', SYSLOG';
print "needs_matched $needs\n" if $needs =~ /^($start(\w+(,\s)?)+)(?!$
print "has_matched $has\n" if $has =~ /^($start(\w+(,\s)?)+)(?!$end)$/
print "needs_matched $needs\n" if $needs =~ /^(log4j.rootLogger=INFO,
print "has_matched $has\n" if $has =~ /^(log4j.rootLogger=INFO, FILE)(
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||