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-rw-r--r--lib/Text/MarkdownBook/Book.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Text/MarkdownBook/Book.pm b/lib/Text/MarkdownBook/Book.pm
index 137a9fa..fa041c5 100644
--- a/lib/Text/MarkdownBook/Book.pm
+++ b/lib/Text/MarkdownBook/Book.pm
@@ -30,7 +30,7 @@ sub new
$self = {};
bless($self, $class);
- unless ($format =~ m/^[a-z]+/) {
+ unless ($format =~ m/^[a-z]+$/) {
Carp::croak('Invalid format "' . $format . '"');
}
eval {