all: update comment URLs from HTTP to HTTPS, where possible

Each URL was manually verified to ensure it did not serve up incorrect
content.

Change-Id: I4dc846227af95a73ee9a3074d0c379ff0fa955df
Reviewed-on: https://go-review.googlesource.com/115798
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

3 files changed, 5 insertions, 5 deletions

diff --git a/src/regexp/exec.go b/src/regexp/exec.go
index 84cb3e6fa5..1c7b02d1cd 100644
--- a/src/regexp/exec.go
+++ b/src/regexp/exec.go
@@ -10,7 +10,7 @@ import (
 )
 
 // A queue is a 'sparse array' holding pending threads of execution.
-// See http://research.swtch.com/2008/03/using-uninitialized-memory-for-fun-and.html
+// See https://research.swtch.com/2008/03/using-uninitialized-memory-for-fun-and.html
 type queue struct {
 	sparse []uint32
 	dense  []entry
@@ -27,7 +27,7 @@ type entry struct {
 
 // A thread is the state of a single path through the machine:
 // an instruction and a corresponding capture array.
-// See http://swtch.com/~rsc/regexp/regexp2.html
+// See https://swtch.com/~rsc/regexp/regexp2.html
 type thread struct {
 	inst *syntax.Inst
 	cap  []int
diff --git a/src/regexp/regexp.go b/src/regexp/regexp.go
index 7a214ad156..09faced8f3 100644
--- a/src/regexp/regexp.go
+++ b/src/regexp/regexp.go
@@ -16,7 +16,7 @@
 // (This is a property not guaranteed by most open source
 // implementations of regular expressions.) For more information
 // about this property, see
-//	http://swtch.com/~rsc/regexp/regexp1.html
+//	https://swtch.com/~rsc/regexp/regexp1.html
 // or any book about automata theory.
 //
 // All characters are UTF-8-encoded code points.
@@ -145,7 +145,7 @@ func Compile(expr string) (*Regexp, error) {
 // specifies that the match be chosen to maximize the length of the first
 // subexpression, then the second, and so on from left to right.
 // The POSIX rule is computationally prohibitive and not even well-defined.
-// See http://swtch.com/~rsc/regexp/regexp2.html#posix for details.
+// See https://swtch.com/~rsc/regexp/regexp2.html#posix for details.
 func CompilePOSIX(expr string) (*Regexp, error) {
 	return compile(expr, syntax.POSIX, true)
 }
diff --git a/src/regexp/syntax/compile.go b/src/regexp/syntax/compile.go
index 83e53ba6ca..1d8ab87a6d 100644
--- a/src/regexp/syntax/compile.go
+++ b/src/regexp/syntax/compile.go
@@ -9,7 +9,7 @@ import "unicode"
 // A patchList is a list of instruction pointers that need to be filled in (patched).
 // Because the pointers haven't been filled in yet, we can reuse their storage
 // to hold the list. It's kind of sleazy, but works well in practice.
-// See http://swtch.com/~rsc/regexp/regexp1.html for inspiration.
+// See https://swtch.com/~rsc/regexp/regexp1.html for inspiration.
 //
 // These aren't really pointers: they're integers, so we can reinterpret them
 // this way without using package unsafe. A value l denotes