Ciao Mark & Mohammad a few tweaks for Mark's solutions ...
* (I'm happy to be aiding Mark, as it's usually the other way round,
lol :-)!*
<option value="^[0-9]*$">Only digits</option>
> <option value="^[a-z]*$">Only lower case</option>
> <option value="^[A-Z]*$">Only upper case</option>
These will work, but would also match "the empty string".
Probably better to use "+" (one or more), not "*" (zero or more), so ...
<option value="^[0-9]+$">Only digits</option>
or use "\d", shorthand for [0-9]
<option value="^\d+$">Only digits</option> "\d" is shorthand for [0-9]
<option value="^[a-z]+$">Only lower case</option>
<option value="^[A-Z]+$">Only upper case</option>
<option value="^[\w-_]*$">Only alphanumeric, _, and -</option>
Its not ideal to put "\w" inside a character class as it is a shorthand
character class for [A-Za-z0-9_].
"\w" already includes "_" so you don't need to add it.
Its not ideal to put "-" in the middle of a character class as it can
sometimes act as a "range marker"
Any of these should work ...
<option value="^(\w|-)+$">Only alphanumeric, _, and -</option>
or
<option value="^[-a-zA-Z0-9_]+$">Only alphanumeric, _, and -</option>
or, its good practice to make explicit the need for literal "-", like so
...
<option value="^[\-a-zA-Z0-9_]+$">Only alphanumeric, _, and -</option>
or, less kosher
<option value="^[\-\w]+$">Only alphanumeric, _, and -</option>
<option value="^[\w]{3,15}$">Only alphanum len 3-15</option>
This simpler regex should work just as well ...
<option value="^\w{3,15}$">Only alphanum len 3-15</option>
<option value="^[A-Z]+.*$">Starts with capital</option>
>
<option value="^[0-9]+.*$">Starts with digit</option>
>
These will work fine. But "match the first character" means they can be
slightly simpler ...
<option value="^[A-Z].*$">Starts with capital</option>
>
<option value="^[0-9].*$">Starts with digit</option>
<option value="^.+\.[a-zA-Z]{3,4}$">Extensions only</option>
>
<option value="^.+(\.jpg|\.gpeg)$">Extension jpg gpeg</option>
Those look fine.
There is a guide to JavaScript regular expressions at:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
TT
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