MongoDB RegEx not working

Question

I\'m trying to return documents that whose obsNum field starts with 1.. I have written the following RegEx to filter out those documents however, it returns all the

Answer 1

The regular expression you might try is:

^(1\.\d+)

Explanation:

• ^ Beginning of the string
• (…) Capturing parentheses: remember the match
• 1 Literal digit
• \d decimal digit
• + At least one