diff --git a/otc_doc_convertor/convertor.py b/otc_doc_convertor/convertor.py
index 826cd0bb..7a7e429d 100644
--- a/otc_doc_convertor/convertor.py
+++ b/otc_doc_convertor/convertor.py
@@ -312,6 +312,8 @@ class OTCDocConvertor:
             r"\s([^a-zA-Z0-9\s]{8,})",
             # BMS API contain sequence in a dedicated paragraph
             r"^([^a-zA-Z0-9\s]{10,})$",
+            # OBS special chars - "\$" "\\" etc
+            r"^(\\[\$\\bfnrtvu]{1})$",
         ]
         for to_rawize in rawize_strings:
             for p in soup.body.find_all(string=re.compile(to_rawize)):