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+*****************
+ltrim() / rtrim()
+*****************
+
+Purpose
+=======
+
+ltrim
+-----
+
+ltrim(str)
+
+Removes any spaces at the start of a given string. Input is a string, output
+is the same string starting with the first non-space character.
+
+
+rtrim
+-----
+
+rtrim(str)
+
+Removes any spaces at the end of a given string. Input is a string, output
+is the same string ending with the last non-space character.
+
+
+Example
+=======
+
+ltrim
+-----
+
+In the following example the spaces at the beginning of the string are removed.
+
+.. code-block:: none
+
+   ltrim("   str ")
+
+produces
+
+.. code-block:: none
+
+   "str "
+
+
+rtrim
+-----
+
+In the following example the spaces at the end of the string are removed.
+
+.. code-block:: none
+
+   rtrim("   str ")
+
+produces
+
+.. code-block:: none
+
+   "   str"
+