Allow range of numbers by regex?

Question

PHP

How can I allow a range of numbers to be entered by a regular expression?
For example, from 1 to 100 inclusive..
check:
if( var >= 1 and 100 <= var )...
not suitable, because the regular expression will go into the input field

<input type="text" pattern="RegEx" title="только от 1 до 100">

Tell me what it will look like?
[0-9][0-9][0]
Allows you to enter and 990
Thank you very much

Answer 1

[1-9]{1}$|^[1-9]{1}[0-9]{1}$|^100

Answer 2

What for? HTML5 has a special field for this.

<input type="number" min="1" max="100" value="1" step="1">

Answer 3

[0-1][0-9][0-9]

Answer 4

(100)|(0*\d{1,2})
https://jsfiddle.net/7wdmq6u5/

Answer 5

^(?!0.*$)([0-9]{1,2})$