Do not split metadata extraction regexes at commas

Better allow using commas in the metadata extraction regexes, instead
and use multiple -m <regex> arguments.

Change-Id: Ia890565cf405478c3383e3a1109190cea8f070da
diff --git a/t/test.t b/t/test.t
index 99f6503..3a34be9 100644
--- a/t/test.t
+++ b/t/test.t
@@ -107,7 +107,7 @@
         fail("cannot open file $w2v_fname");
         next;
     }
-    script_runs([ 'script/korapxml2conllu', '-m', '<textSigle>([^<.]+)', '-m', '<creatDate>([^<]{7})', '--word2vec', $base_fname ], "Runs korapxml2conllu with base input and w2v and metadata output");
+    script_runs([ 'script/korapxml2conllu', '-m', '<textSigle>([^<.]+)', '-m', '<creatDate>([^<]{4,7})', '--word2vec', $base_fname ], "Runs korapxml2conllu with base input and w2v and metadata output");
     script_stdout_is $expected, "Converts $base_fname correctly to word2vec input format together with some metadata";
 }