ICU-21520 Fixes typo in name of test data file; removes a regex that
evaluates to the empty string and the result files are missing the
perf test name as a result. E.g. '_Mar_16_155820.html' instead of
'unisetperf_Mar_16_155820.html'.
Not obvious why the regex was even created since it doesn't seem
necessary because the name of the caller doesn't require additional
parsing. The rpaticular code is from 2002, maybe changes in Perl
account for the issue(?)
diff --git a/icu4c/source/test/perf/normperf/NormPerf.pl b/icu4c/source/test/perf/normperf/NormPerf.pl
index a37e28c..5c16212 100755
--- a/icu4c/source/test/perf/normperf/NormPerf.pl
+++ b/icu4c/source/test/perf/normperf/NormPerf.pl
@@ -53,7 +53,7 @@
         "TestNames_SerbianSH.txt",
         "TestNames_SerbianSR.txt",
         "TestNames_Thai.txt",
-        "Testnames_Russian.txt",
+        "TestNames_Russian.txt",
         "th18057.txt",
         "thesis.txt",
         "vfear11a.txt",
diff --git a/icu4c/source/test/perf/normperf/NormPerf_r.pl b/icu4c/source/test/perf/normperf/NormPerf_r.pl
index 673afef..e81c242 100755
--- a/icu4c/source/test/perf/normperf/NormPerf_r.pl
+++ b/icu4c/source/test/perf/normperf/NormPerf_r.pl
@@ -55,7 +55,7 @@
         "TestNames_SerbianSH.txt",
         "TestNames_SerbianSR.txt",
         "TestNames_Thai.txt",
-        "Testnames_Russian.txt",
+        "TestNames_Russian.txt",
         "th18057.txt",
         "thesis.txt",
         "vfear11a.txt",
diff --git a/icu4c/source/test/perf/perldriver/Output.pm b/icu4c/source/test/perf/perldriver/Output.pm
index 3e74bc9..8f6e45c 100644
--- a/icu4c/source/test/perf/perldriver/Output.pm
+++ b/icu4c/source/test/perf/perldriver/Output.pm
@@ -190,8 +190,6 @@
   @headers = split(/ /, $headers);
   my ($t, $rest);
   ($t, $rest) = split(/\.\w+/, $0);
-  $t =~ /^.*\W(\w+)$/;
-  $t = $1;
   if($outType eq 'HTML') {
     $html = $date;
     $html =~ s/://g; # ':' illegal
diff --git a/icu4c/source/test/perf/ubrkperf/UBrkPerf_r.pl b/icu4c/source/test/perf/ubrkperf/UBrkPerf_r.pl
index 34c5f1f..8b44596 100755
--- a/icu4c/source/test/perf/ubrkperf/UBrkPerf_r.pl
+++ b/icu4c/source/test/perf/ubrkperf/UBrkPerf_r.pl
@@ -72,7 +72,7 @@
         "TestNames_SerbianSH.txt",
         "TestNames_SerbianSR.txt",
         "TestNames_Thai.txt",
-        "Testnames_Russian.txt",
+        "TestNames_Russian.txt",
     ],
     "th",
     [
diff --git a/icu4c/source/test/perf/ustrperf/StringPerf.pl b/icu4c/source/test/perf/ustrperf/StringPerf.pl
index 378cbc1..54f905f 100755
--- a/icu4c/source/test/perf/ustrperf/StringPerf.pl
+++ b/icu4c/source/test/perf/ustrperf/StringPerf.pl
@@ -68,7 +68,7 @@
         "TestNames_SerbianSH.txt",
         "TestNames_SerbianSR.txt",
         "TestNames_Thai.txt",
-        "Testnames_Russian.txt",
+        "TestNames_Russian.txt",
         "th18057.txt",
     ]
 };
diff --git a/icu4c/source/test/perf/ustrperf/StringPerf_r.pl b/icu4c/source/test/perf/ustrperf/StringPerf_r.pl
index 5875950..e2c8faf 100755
--- a/icu4c/source/test/perf/ustrperf/StringPerf_r.pl
+++ b/icu4c/source/test/perf/ustrperf/StringPerf_r.pl
@@ -54,7 +54,7 @@
         "TestNames_SerbianSH.txt",
         "TestNames_SerbianSR.txt",
         "TestNames_Thai.txt",
-        "Testnames_Russian.txt",
+        "TestNames_Russian.txt",
         "th18057.txt",
         "thesis.txt",
         "vfear11a.txt",