[core-utils] modify gnc:format to accept -

this allows use of varnames such as ${report-title}

bindings/guile/core-utils.scm

@@ -111,7 +111,7 @@
 (set-exception-printer! 'unbound-variable print-unbound-variable-error)
 
 ;; format.
-(define %regex (make-regexp "[$][{]([[:alnum:]]+)[}]"))
+(define %regex (make-regexp "[$][{]([[:alnum:]\\-]+)[}]"))
 (define (gnc:format str . bindings)
   (define hash (make-hash-table))
   (define (substitute m)

bindings/guile/test/test-core-utils.scm

@@ -30,6 +30,10 @@
     "basic test"
     (gnc:format "basic ${job}" 'job "test"))
 
+  (test-equal "one substitution with hyphen"
+    "master chief"
+    (gnc:format "master ${job-title}" 'job-title "chief"))
+
   (test-equal "two substitutions out of order"
     "basic test"
     (gnc:format "${difficulty} ${job}" 'job "test" 'difficulty "basic"))