subcommand: Use POSIX compatible command regex.

The POSIX way to ask for one or more matches of the preceeding atom
is {1,} while the plus character is a non-portable shortcut.

Note that since the closing brace of the regex bound is inside
parameter expansion, we need to escape it with a backslash while the
opening brace must not be escaped.

diff --git a/subcommand b/subcommand
index 261e35f5e39b6f377529c24a136427106d6301cb..ca546bd1617074d86813135f54c9dc2f7f7e5873 100644 (file)
--- a/subcommand
+++ b/subcommand
@@ -25,7 +25,7 @@ _gsu_usage()
 # exactly one parenthesized subexpression for matching the command name.
 _gsu_get_command_regex()
 {
-       local cmd="${1:-[-a-zA-Z_0-9]+}"
+       local cmd="${1:-[-a-zA-Z_0-9]{1,\}}"
        result="^com_($cmd)\(\)"
 }