finished first 3 regex exercises. added shells for other files.

chapter7/containsAPeriod

@@ -0,0 +1,7 @@
+#!/usr/bin/perl -w
+use strict;
+use 5.010;
+
+while (<>){
+    print $_ if (m/[.]+/);
+}

chapter7/fredTester.txt

@@ -0,0 +1,22 @@
+1 fred
+2 Fred
+3 ffred
+4 Ffred
+5 frederick
+6 Frederick
+7 Alfred
+8 AlFred
+9 FRED
+10 FReD
+11 FREd
+12 FrED
+13 FreD
+14 fRED
+15 freD
+16 Mr. Fred Flinstone
+17 Dr. Fred Flinstone
+18 ........
+19 ..
+20 _______. 
+21 a.a
+22 .a.

chapter7/mentionsFred

@@ -0,0 +1,7 @@
+#!/usr/bin/perl -w
+use strict;
+use 5.010;
+
+while (<>){
+    print $_ if (m/\b(?:fred)\b/);
+}

chapter7/mentionsFredOrfred

@@ -0,0 +1,7 @@
+#!/usr/bin/perl -w
+use strict;
+use 5.010;
+
+while (<>){
+    print $_ if (m/\b(?:[Ff]red)\b/);
+}