Switch regex type from sys:regex to regex.

The sys:regex internal symbol was historically used when
derivative-based regexes had a S-exp representation headed
by that symbol. It had to be a private symbol.
Now the regex symbol is only used as the COBJ class type
for regexes; it makes no sense for it to be in the sys
package. We want user code to be able to refer to this
type using a public symbol.

* lib.c (obj_init): Intern the regex symbol stored
in regex_s in user_package.

* txr.1: Include regex in the type graph in the
Object Type section, and in the type list under
the typeof function.

1 files changed, 5 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index 3a6bf27a..58506358 100644
--- a/txr.1
+++ b/txr.1
@@ -14644,6 +14644,8 @@ brackets indicate a plurality of types which are not listed by name:
         |                    |
         |                    +--- random-state
         |                    |
+        |                    +--- regex
+        |                    |
         |                    +--- struct-type
         |                    |
         |                    +--- <structures>
@@ -14800,6 +14802,9 @@ Hash table.
 .coIP stream
 I/O stream of any kind.
 
+.coIP regex
+Regular expression object.
+
 .coIP struct-type
 A structure type: the type of any one of the values which represents
 a structure type.