Remove printing facilities for Regular_Expression

The `original_pattern` introduced a tenuous dependency to the expression
value as a whole, and after some consideration, I decided that it would
be better for the developer to manage their own pattern strings.

In the event you need to print the text representation of a pattern,
it's usually better that you manage the memory of it as well.

tests/benchmark/text/regex/benchmark_regex.odin

@@ -111,7 +111,7 @@ global_capture_end_word :: proc(t: ^testing.T) {
 	}
 	defer regex.destroy(rex)
 
-	report := fmt.tprintf("Matching %v over a block of random ASCII text.", rex)
+	report := fmt.tprintf("Matching %q over a block of random ASCII text.", EXPR)
 
 	for size in sizes {
 		data := make([]u8, size)
@@ -151,7 +151,7 @@ global_capture_end_word_unicode :: proc(t: ^testing.T) {
 	}
 	defer regex.destroy(rex)
 
-	report := fmt.tprintf("Matching %v over a block of random Unicode text.", rex)
+	report := fmt.tprintf("Matching %q over a block of random Unicode text.", EXPR)
 
 	for size in sizes {
 		data := make([]u8, size)
@@ -191,7 +191,7 @@ alternations :: proc(t: ^testing.T) {
 	}
 	defer regex.destroy(rex)
 
-	report := fmt.tprintf("Matching %v over a text block of only `a`s.", rex)
+	report := fmt.tprintf("Matching %q over a text block of only `a`s.", EXPR)
 
 	for size in sizes {
 		data := make([]u8, size)
@@ -225,7 +225,7 @@ classes :: proc(t: ^testing.T) {
 	}
 	defer regex.destroy(rex)
 
-	report := fmt.tprintf("Matching %v over a string of spaces with %q at the end.", rex, NEEDLE)
+	report := fmt.tprintf("Matching %q over a string of spaces with %q at the end.", EXPR, NEEDLE)
 
 	for size in sizes {
 		data := make([]u8, size)

tests/core/text/regex/test_core_text_regex.odin

@@ -681,28 +681,6 @@ test_optional_inside_optional :: proc(t: ^testing.T) {
 	check_expression(t, EXPR, "", "")
 }
 
-@test
-test_printing :: proc(t: ^testing.T) {
-	rex, err := regex.create(`^/a$`, {
-		.Global,
-		.Multiline,
-		.Case_Insensitive,
-		.Unicode,
-		.Ignore_Whitespace,
-		.No_Optimization,
-		.No_Capture,
-	})
-	if !testing.expect_value(t, err, nil) {
-		return
-	}
-	defer regex.destroy(rex)
-
-	str := fmt.tprint(rex)
-	str_hash := fmt.tprintf("%#v", rex)
-	testing.expect_value(t, str, `/^\/a$/gmixun-`)
-	testing.expect_value(t, str_hash, `/^\/a$/gmixun-`)
-}
-
 
 
 @test