diff options
Diffstat (limited to 're.c')
-rw-r--r-- | re.c | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -3195,6 +3195,7 @@ rb_reg_s_union(VALUE self, VALUE args0) * <em>pattern</em>s, i.e., will match any of its parts. The <em>pattern</em>s * can be Regexp objects, in which case their options will be preserved, or * Strings. If no patterns are given, returns <code>/(?!)/</code>. + * The behavior is unspecified if any given <em>pattern</em> contains capture. * * Regexp.union #=> /(?!)/ * Regexp.union("penzance") #=> /penzance/ |