Regular Expressions to validate data

[progwihz@yahoo.com]

Hi all, am trying to implement some regex functions for data validation. As it’s quite confusing (for me at least) I’ve decided to layout what I am trying to achieve below.  I’ve got several senarios that I am trying to generate regex to accomplish.

 

 

1. validate string data (allow alpha num  _- +) no spaces allowed

2. validate string data (allow alpha, num _ - + &) no spaces allowed

3. validate string data (allow num only with max length of 2) no spaces allowed

4 validate data (allow num only) any length

 

 

many thanks

[effigy]

3 and 4 can match nothing at all:

 

1. /\A[-+\w]\z/

2. /\A[-+&\w]\z/

3. /\A\d{,2}\z/

4. /\A\d*\z/