Regular Expression

Question

I'm trying to get the regular expression to work (using jQuery) for a specific pattern I need.

I need following pattern:

First two character

• s of the string need to be numbers (0-9) but maximum number is 53. for numbers below 10 a leading 0 is required
• Character on position 3 needs to be a .
• the next 4 characters need to be a number between 0-9, minimum number should be 2010, maximum 2050

so, Strings like 01.2020, 21.2020, or 45.2020 have to match but 54.2020 or 04.2051 must not.

I tried to write the regex without the min and max requirement first and I'm testing the string using regex101.com but I'm unable to get it to work.

acording to the definition /^[0-9]{2}\.\d[0-9]{4}$/ should allow me to insert the strings in the format NN.NNNN.

thankful for any input.

Answer 1

2 numbers from 00 to 53 can be matched using this : (?:[0-4][0-9]|5[0-3]) (00 -> 49 or 50 -> 53)

Character on position 3 needs to be a . : you've already got the \.

a number between 2010 and 2050 -> 20(?:[1-4][0-9]|50) (20 followed by either 10 -> 49 or 50)

This gives :

(?:[0-4][0-9]|5[0-3])\.20(?:[1-4][0-9]|50)