Question

What is the regular expression pattern of below string (SQL query)?

Select col1,colo2,col3 form tablename where col1='this is a test'

It no needs to like order by distinct and etc.

Just simple select and where clause.

Answer 1

This supports flexible spacing around your commas, etc.. The raw regex should look like this:

^Select\s+(?:\w+\s*(?:(?=from\b)|,\s*))+from\s+\w+\s+where\s+\w+\s*=\s*'[^']*'$

You’ll need to escape any platform-specific characters (for example, in C#, \s needs to be \\s.) In C#, it would look like this: @"^Select\s+(?:\w+\s*(?:(?=from\b)|,\s*))+from\s+\w+\s+where\s+\w+\s*=\s*'[^']*'$"

Also, don’t forget to make your expression ignore case. In javascript it might end in /i like this: /select ...+/i.