CODEWITHSUNDEEP
regexperl
alex
alex

Reputation: 95

regex how to find those lines that don't start with a given string?

what regex can i use using perl flavor, to find all those lines that don't start with the tag .

the text i have is more or less like this: 

<english> text text text text.
<english> text text text.
text text text

i need to verify, that all lines start with and i want to see all of those that don't start with it.

what i have tried is : 

^[^<english>].*$

(?!^<english>).*

(?<!<english>).*

.*(?!<english>).*

but non of those work.

can somebody please help me, and explain the provided regex? thanks.

Upvotes: 0

Views: 379

Answers (2)

sshashank124
sshashank124

Reputation: 32189

You need to do it as:

^(?!<english>).*?$ with the g and m modifier

This matches those lines that do not start with <english>

Demo: http://regex101.com/r/xZ1xF4

Upvotes: 3

Miller
Miller

Reputation: 35198

You don't need any assertions, just do the test:

use strict;
use warnings;

while (<DATA>) {
    if (/^<english>/) {
        print "matches:  $_";
    } else {
        print "no match: $_";
    }
}

__DATA__
<english> text text text text.
<english> text text text.
text text text

Upvotes: 3

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