Validate that a string contains only space-delimited alphanumeric words which do not start with a digit

I want to use preg_match() such that there should not be special characters such as @#$%^&/ ' in a given string.

For example :

• Coding : Outputs valid
• : Outputs Invalid (string beginning with space)
• Project management : Outputs valid (space between two words are valid)
• Design23 : Outputs valid
• 23Designing : Outputs invalid
• 123 :Outputs invalid

I tried but could not reach to a valid answer.

Try

'/^[a-zA-Z][\w ]+$/'