diff --git a/rich/text.py b/rich/text.py
index 71eb82bb..8e3d5380 100644
--- a/rich/text.py
+++ b/rich/text.py
@@ -413,13 +413,13 @@ class Text(JupyterMixin):
             if style:
                 start, end = get_span()
                 match_style = style(plain[start:end]) if callable(style) else style
-                if match_style is not None and end - start:
+                if match_style is not None and end > start:
                     append_span(_Span(start, end, match_style))
 
             count += 1
             for name in match.groupdict().keys():
                 start, end = get_span(name)
-                if start != -1 and end - start:
+                if start != -1 and end > start:
                     append_span(_Span(start, end, f"{style_prefix}{name}"))
         return count