Added String Replace article

Author: waqasm78

docs2/pages/documentations/string/string-replace.md

@@ -0,0 +1,50 @@
+# String_Replace
+
+`String_Replace` returns a new string in which all occurrences of a specified `oldValye` Unicode character or String in the `source` string are replaced with another specified `newValue` Unicode character or String.
+
+```csharp
+String_Replace (
+	@source NVARCHAR (MAX),
+	@oldValue NVARCHAR (MAX),
+	@newValue NVARCHAR (MAX)
+	)
+RETURNS NVARCHAR (MAX)
+```
+
+## Parameters
+
+  - **source**: The source string.
+  - **oldValue**: The string to be replaced.
+  - **newValue**: The string to replace all occurrences of oldValue.
+
+## Returns
+
+ - A string that is equivalent to the `source` string except that all instances of `oldValue` are replaced with `newValue`. 
+ - If `oldValue` is not found in the current instance, the method returns the `source` string without any changes.
+
+## Example
+
+```csharp
+SELECT SQLNET::String_Replace('1 2 3 4 5 6 7 8 9', ' ', ',')
+SELECT SQLNET::String_Replace('This docment uses 3 other docments to docment the docmentation', 'docment', 'document')
+```
+
+# String_Replace4k
+
+It is equivalent to `String_Replace` except no NVARCHAR(MAX) parameters; it can be used when input data will never be over 4000 characters as this function offers better performance.
+
+```csharp
+String_Replace4k (
+	@source NVARCHAR (4000),
+	@oldValue NVARCHAR (MAX),
+	@newValue NVARCHAR (MAX)
+	)
+RETURNS NVARCHAR (4000)
+```
+
+## Example
+
+```csharp
+SELECT SQLNET::String_Replace4k('1 2 3 4 5 6 7 8 9', ' ', ',')
+SELECT SQLNET::String_Replace4k('This docment uses 3 other docments to docment the docmentation', 'docment', 'document')
+```

docs2/pages/documentations/string/string.md

@@ -2,7 +2,6 @@
 
 Represents text as a sequence of UTF-16 code units.
 
-
 | Name | Description | Example |
 | :--- | :---------- | :------ |
 | [String_Compare(strA, strB)](/string-compare) | Compares two specified String objects. | [Try it]()|
@@ -36,3 +35,4 @@ Represents text as a sequence of UTF-16 code units.
 | [String_PadRight(source, totalWidth, paddingChar)](/string-padright) | Returns a new string that left-aligns the characters in this instance by padding them on the right with a specified Unicode character, for a specified total length. | [Try it]()|
 | [String_Remove(source, startIndex)](/string-remove) | Returns a new string in which all the characters in the `source` string, beginning at a specified position are deleted till the end of the `source` string. | [Try it]()|
 | [String_RemoveNumOfChars(source, startIndex, count)](/string-remove-num-of-chars) | Returns a new string in which a specified number of characters in the `source` beginning at a specified position have been deleted. | [Try it]()|
+| [String_Replace(source, oldValue, newValue)](/string-remove) | Returns a new string in which all occurrences of a specified Unicode character or String in the current string are replaced with another specified Unicode character or String. | [Try it]()|