SharePoint 2013 - Change URL of document library

When you create a document library, it ask you the name for the DL. Once you give it, it will create library with same name and URL. You can change the name of the library any time but cannot change the url. Here are the things i followed to create url accroding to my needs:

1. Just go to a library trough 'Site Content'
2. When inside the library choose on the ribbon 'Library' tab.
3. Then select 'Open with Explorer'.That will open your SharePoint's library in Windows Explorer window.
4. Navigate one folder up and you will see list of your libraries as folders.
5. Rename required library's folder name as you want the URL to look like.
6. Close the windows and refresh the browser or go back to home page and browse the library again.

Reference:
http://sharepoint.stackexchange.com/questions/111524/sharepoint-2013-change-url-of-document-library
http://stackoverflow.com/questions/12904944/change-sharepoint-library-url

SharePoint Filtered Lookup Field

Download here: http://filteredlookup.codeplex.com/

This project creates a custom SharePoint lookup field that offers new functionalities to default SharePoint lookup field by allowing filters to be applied to retrieved data. Applied filters can be either dynamic CAML queries or pre-defined list views residing in source lists

Below is a few of the features offered by Filtered Lookup field over standard SharePoint Lookup field:

• Cross-site lookup (all sites within same site collection)
• Filter retrieved data using list views
• Filter retrieved data using dynamic/ad-hoc CAML queries. This means you don't need to create a list view each time you want to apply a lookup filter to source data
• Supports retrieving data recursively using either list views or dynamic queries
• Supports MultiLookup with filtered data
• Same look and feel as default SharePoint Lookup and MultiLookup (i.e. in list forms)

How to validate the special character on SharePoint List Column

Step 1: Open Column Settings for which column you want to add the validations:

List Settings > Change Column > Column Validation (below Column Settings) 

Step 2: Add the following code at the Column Validation:

=AND(IF(ISERROR(FIND(",",[ColumnName])),TRUE),IF(ISERROR(FIND("&",[ColumnName])),TRUE),IF(ISERROR(FIND("!",[ColumnName])),TRUE),IF(ISERROR(FIND("@",[ColumnName])),TRUE),IF(ISERROR(FIND("~",[ColumnName])),TRUE),IF(ISERROR(FIND("#",[ColumnName])),TRUE),IF(ISERROR(FIND("$",[ColumnName])),TRUE),IF(ISERROR(FIND("%",[ColumnName])),TRUE),IF(ISERROR(FIND("*",[ColumnName])),TRUE),IF(ISERROR(FIND("(",[ColumnName])),TRUE),IF(ISERROR(FIND(")",[ColumnName])),TRUE),IF(ISERROR(FIND("-",[ColumnName])),TRUE),IF(ISERROR(FIND("+",[ColumnName])),TRUE),IF(ISERROR(FIND(":",[ColumnName])),TRUE),IF(ISERROR(FIND(";",[ColumnName])),TRUE),IF(ISERROR(FIND("[",[ColumnName])),TRUE),IF(ISERROR(FIND("]",[ColumnName])),TRUE),IF(ISERROR(FIND(".",[ColumnName])),TRUE),IF(ISERROR(FIND("/",[ColumnName])),TRUE),IF(ISERROR(FIND("\",[ColumnName])),TRUE))