diff --git a/strictdoc/backend/sdoc_source_code/comment_parser/marker_lexer.py b/strictdoc/backend/sdoc_source_code/comment_parser/marker_lexer.py
index 0a093945b..31bbaff7e 100644
--- a/strictdoc/backend/sdoc_source_code/comment_parser/marker_lexer.py
+++ b/strictdoc/backend/sdoc_source_code/comment_parser/marker_lexer.py
@@ -24,7 +24,7 @@ class GrammarTemplate(Template):
 node_name: /##CUSTOM_TAGS/
 node_multiline_value: (_WS_INLINE? | (_WS_INLINE NODE_STRING_VALUE)) NEWLINE (NODE_STRING_VALUE NEWLINE)*
 
-NODE_STRING_VALUE.2: /(?![ ]*##RELATION_MARKER_START)(?!\\s*(##CUSTOM_TAGS):\\s)(?!\\s*##NODE_FIELD_END_MARKER)[^\n\r]+/x
+NODE_STRING_VALUE.2: /(?![ ]*##RELATION_MARKER_START)(?!\\s*(##CUSTOM_TAGS):\\s)(?!\\s*##NODE_FIELD_END_MARKER)[^\\n\\r]+/
 
 _NORMAL_STRING_NO_MARKER_NO_NODE: /(?!\\s*##RELATION_MARKER_START)((?!\\s*(##CUSTOM_TAGS):\\s)|(##RESERVED_KEYWORDS)).+/
 """)
diff --git a/tests/unit/strictdoc/backend/sdoc_source_code/test_marker_lexer.py b/tests/unit/strictdoc/backend/sdoc_source_code/test_marker_lexer.py
index cdef05776..e9ff05bf9 100644
--- a/tests/unit/strictdoc/backend/sdoc_source_code/test_marker_lexer.py
+++ b/tests/unit/strictdoc/backend/sdoc_source_code/test_marker_lexer.py
@@ -4,7 +4,7 @@
 
 from typing import Any, List, Optional
 
-from lark import Tree
+from lark import Token, Tree
 
 from strictdoc.backend.sdoc_source_code.comment_parser.marker_lexer import (
     MarkerLexer,
@@ -489,6 +489,46 @@ def test_34_node_text_starting_below() -> None:
     )
 
 
+def test_35a_node_value_newline_lf() -> None:
+    """Verify that LF goes into a separate NEWLINE token."""
+    input_string = "FIELD: value1\nvalue2\n"
+    tree = MarkerLexer.parse(input_string, custom_tags={"FIELD"})
+
+    node_fields = list(tree.find_data("node_field"))
+
+    assert_node_field(
+        node_fields[0],
+        "FIELD",
+        [
+            Token("NODE_STRING_VALUE", "value1"),
+            Token("NEWLINE", "\n"),
+            Token("NODE_STRING_VALUE", "value2"),
+            Token("NEWLINE", "\n"),
+        ],
+    )
+
+
+def test_35b_node_value_newline_crlf() -> None:
+    """Verify that CR LF goes into a separate NEWLINE token."""
+    input_string = "FIELD: value1\r\nvalue2\r\n"
+    tree = MarkerLexer.parse(input_string, custom_tags={"FIELD"})
+
+    node_fields = list(tree.find_data("node_field"))
+
+    assert_node_field(
+        node_fields[0],
+        "FIELD",
+        [
+            Token("NODE_STRING_VALUE", "value1"),
+            Token("NEWLINE", "\r\n"),
+            Token("NODE_STRING_VALUE", "value2"),
+            # The implicit \r\n => \n conversion at EOF is not nice, but doesn't hurt (yet).
+            # We need to improve EOF handling in lark grammar to get rid of it.
+            Token("NEWLINE", "\n"),
+        ],
+    )
+
+
 def test_60_exclude_reserved_keywords() -> None:
     input_string = """
         FIXME: This can likely replace _weak below with no problem.