Make a regex to validate string in particular format

Question

I am trying to write a regex that matches my string with below format:

Total there will be 10 to 12 characters in a string.
And first 3 characters are distinct uppercase letters.
Then the next 4 characters represent the birth year and will always be between 1900 and 2019.
The next characters represent the number which can be either of these {10,20,50,100,200,500,1000}.
The last character is an uppercase letter.

I came up with below regex but having issues coming up for my third point. This line (1[9][0-9]{2}|2019) looks wrong and it doesn't work for string UYT20121000X:

^(([A-Z])(?!\2)([A-Z])(?!\2|\3)[A-Z])(1[9][0-9]{2}|2019)(10{1,3}|[25]00?)([A-Z])$

After using above regex I will extract the number which matches my fourth point.

Try it like this ^(([A-Z])(?!\2)([A-Z])(?!\2|\3)[A-Z])(?:19\d{2}|20[01]\d)(?:1000|[125]0?0)[A-Z]$ regex101.com/r/uHCjPD/1 — The fourth bird
– The fourth bird, Commented Oct 25, 2020 at 20:17

The fourth bird · Accepted Answer · 2020-10-25 20:37:41Z

1

You could use (?:19\d{2}|20[01]\d) to match the range from 1900-2019.

It matches from 1900 till 1999 or from 2000 till 2019

The updated pattern could look like

^(([A-Z])(?!\2)([A-Z])(?!\2|\3)[A-Z])(19\d{2}|20[01]\d)(10{1,3}|[25]00?)([A-Z])$

Regex demo

edited Oct 25, 2020 at 20:37

answered Oct 25, 2020 at 20:20

The fourth bird

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The fourth bird Over a year ago

@user1950349 Ok then you can keep the capturing groups. I have put them back.

mankowitz · Accepted Answer · 2020-10-25 20:17:53Z

1

Try ^(([A-Z])(?!\2)([A-Z])(?!\2|\3)[A-Z])(19[0-9]{2}|20[01][0-9])(10{1,3}|[25]00?)([A-Z])$

The format you want is either 19aa or 20ba

where a is any digit and b is either 0 or 1

answered Oct 25, 2020 at 20:17

mankowitz

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Bohemian · Accepted Answer · 2020-10-25 20:24:39Z

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Your regex only matches exactly 2019 from this century, not the range 2000-2019.

To match the range 1900-2019:

(19\d\d|20[01]\d)

Putting in your regex (and removing unnecessary groups):

^([A-Z])(?!\1)([A-Z])(?!\1|\2)[A-Z](19\d\d|20[01]\d)(10{1,3}|[25]00?)([A-Z])$

edited Oct 25, 2020 at 20:24

answered Oct 25, 2020 at 20:18

Bohemian♦

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