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How to extract the substring from a delimiter (dot) to end of string?

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Contributed by Anonymous Monk on May 08, 2000 at 09:29 UTC
Q&A  > data formatting


Description:

Given a string like

$string = "helloyoume.she";
How would you extract the characters from the dot (aka period, aka full stop) to the end of that string into a variable? That is, in this example, get the substring "she".

Answer: How to extract the substring from a delimiter (dot) to end of string?
contributed by infoninja

Here's a solution which doesn't use regexes, which are probably overkill for this application:

$extension = substr( $string, rindex( $string, '.' ) + 1 );
Answer: How to extract the substring from a delimiter (dot) to end of string?
contributed by Novician

How about using split:

$extension = (split /\./, $string)[-1];
Answer: How to extract the substring from a delimiter (dot) to end of string?
contributed by httptech

Here's one way to do it, iterating backwards over the string as an array, then unshifting each char into another array until reaching the dot. Of course, you wouldn't normally want to do it this way in practice.

my @temp; for ( reverse @{[ split( '', $string ) ]} ) { last if /\./; unshift @temp, $_; } $extension = join '', @temp;
Answer: How to extract the substring from a delimiter (dot) to end of string?
contributed by ZZamboni

In the spirit of TIMTOWTDI, you could also do:

( $extension ) = $string =~ /([^.]*)$/;

The above will give you the whole string if it does not contain any dots. If you want the result to be undef if there are no dots, you could use:

( $extension ) = $string =~ /\.([^.]*)$/;

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