docs: document Syntax.stylize_range with working examples

docs/source/syntax.rst

@@ -44,6 +44,55 @@ Background color
 You can override the background color from the theme by supplying a ``background_color`` argument to the constructor. This should be a string in the same format a style definition accepts, e.g. "red", "#ff0000", "rgb(255,0,0)" etc. You may also set the special value "default" which will use the default background color set in the terminal.
 
 
+Stylize Range
+-------------
+
+You can apply custom styling to specific portions of syntax highlighted code
+using the :meth:`~rich.syntax.Syntax.stylize_range` method::
+
+    from rich.console import Console
+    from rich.syntax import Syntax
+    from rich.style import Style
+
+    console = Console()
+
+    code = """\
+def fibonacci(n):
+    if n <= 1:
+        return n
+    return fibonacci(n - 1) + fibonacci(n - 2)"""
+
+    syntax = Syntax(code, "python", line_numbers=True)
+    syntax.stylize_range(Style(bgcolor="bright_yellow"), (3, 4), (3, 13))
+    console.print(syntax)
+
+The ``stylize_range`` method accepts a :class:`~rich.style.Style` object and
+two positional tuples: ``start`` and ``end``.
+
+Positions are specified as ``(line, column)`` tuples where:
+
+- ``line`` is 1-based (the first line is 1)
+- ``column`` is 0-based (the first character on a line is 0)
+
+You can also pass ``style_before=True`` to apply the style underneath
+any existing styles, instead of on top::
+
+    syntax.stylize_range(
+        Style(bold=True),
+        (1, 0), (1, 3),
+        style_before=True,
+    )
+
+.. note::
+
+    Line numbers are based on the original code, not the displayed output.
+    If your code contains newline characters (``\\n``), each newline
+    increments the line number.
+
+For a complete working example, see
+``examples/sintaxy_with_styles.py``.
+
+
 Syntax CLI
 ----------
 

examples/sintaxy_with_styles.py

@@ -0,0 +1,27 @@
+"""
+Demonstration of Syntax.stylize_range
+"""
+
+from rich.console import Console
+from rich.style import Style
+from rich.syntax import Syntax
+
+console = Console()
+
+# Example 1: Single-line code
+code1 = "example = True"
+syntax1 = Syntax(code1, "python")
+syntax1.stylize_range(Style(bgcolor="bright_yellow"), (1, 10), (1, 14))
+console.print("Example 1 - Highlight 'True':")
+console.print(syntax1)
+
+# Example 2: Multi-line code with line numbers
+code2 = """def fibonacci(n):
+    if n <= 1:
+        return n
+    return fibonacci(n - 1) + fibonacci(n - 2)"""
+syntax2 = Syntax(code2, "python", line_numbers=True)
+# Highlight "return n" on line 3
+syntax2.stylize_range(Style(bgcolor="deep_sky_blue4", bold=True), (3, 4), (3, 13))
+console.print("\nExample 2 - Highlight 'return n' (with line numbers):")
+console.print(syntax2)