cfml

I'm sure I'm being dumb, and I don't need to use isValid() for these, but can someone tell me why these are both false?
```#isValid("regex", "c", "a-e")#
#isValid("regex", "123", "0-9+")#```


<https://trycf.com/gist/ad2e9ec4ee348352d381df0e1f4a018c/lucee5?theme=monokai>

Yeah. Doh. I knew it was a temporary blind spot. I actually do know how regexes work :slightly_smiling_face: Caffeine...

That's even what I wrote in my actual code where I used reFind() instead.

i've never used isValid("regex").  is there any compelling reason to do so vs the other regex BIFs?

Not as far as I know, which is why I used reFind() in my actual code.
I was just curious about isValid() since I hadn't used it.

It is more _readable_ it's clear that you're checking it's a valid value, whereas reFind &gt; 0 is a bit more verbose, so that would be a reason I can think of to use it (I don't think I ever have though!)

I guess you could also make it dynamic, so the rules are defined in an array of structs and then you could loop though and do `isValid( rule.type, myvalue, rule.pattern )` or something

How about:

```#isValid("regex", "c", "[a-e]+")#
#isValid("regex", "123", "[0-9]+")#```
You need to add the `character class` square brackets to get a `true` result. The _regex_ you have written is indeed `false`.

<https://trycf.com/gist/78d477dacdadea35c53a18c5c8c3fa30/lucee5?theme=monokai>