diff --git a/assets/howto.md b/assets/howto.md
index 2b1c77e..01cebc3 100644
--- a/assets/howto.md
+++ b/assets/howto.md
@@ -61,6 +61,19 @@ pub const DEFAULT_REG_EXP: &str = r"(\d+) (\w+) (\d+)";
 
 **reg_exp** can be provided but as a **regex** expresion from **string**, if it can not be converted parser exit.
 
+To solve this
+
+```toml
+be_quiet = false
+[[targets]]
+input = "input.txt"
+# \ has to be escaped
+reg_exp = "(\\d+) (\\w+) (\\d+)"
+
+[[targets]]
+input = "input_2.txt"
+```
+
 #### CAUTION
 
 Command line options have precedence over **config path** settings. <br>
diff --git a/howto.md b/howto.md
index 4be78a6..2eee117 100644
--- a/howto.md
+++ b/howto.md
@@ -63,6 +63,19 @@ pub const DEFAULT_REG_EXP: &str = r"(\d+) (\w+) (\d+)";
 
 **reg_exp** can be provided but as a **regex** expresion from **string**, if it can not be converted parser exit.
 
+To solve this 
+
+```toml
+be_quiet = false 
+[[targets]]
+input = "input.txt"
+# \ has to be escaped 
+reg_exp = "(\\d+) (\\w+) (\\d+)"
+
+[[targets]]
+input = "input_2.txt"
+```
+
 > [!CAUTION]
 > Command line options have precedence over **config path** settings. <br>
 > Be careful with the combinations