Determining syllables

Hello,
I'm trying to find a way to break up a word into syllables without knowing anything about the word. I found a way at [link] which is:

1. Isolate the prefix.
2. Separate the suffix.
3. If the first letter in the stem begins with a consonant, underline three letters.
4. If the first letter in the stem begins with a vowel, underline two letters.
5. Repeat steps 3 & 4 for each subsequent set of letters in the stem until all letters have been underlined and thus grouped into syllables

Now my question, is this method 100% accurate? Also is there anything else I need to know about this method?

Thanks in advance.

Hmm... that's not good. :(

Are there any exceptions you know of?

Or better, a diffrent method that's more accurate.

:(

Sounding out the word and tapping wouldn't work because I'm trying to make an AI chatbot that dosn't use an online dictionary. Instead the program goes through the sentence and looks for certain keywords such as am, were, do, not, ect... and analyzes what type of input the user wrote (question, negative statement...).

For a while it worked, but then there started to be special rules for adding prefixes/suffixes where the spelling depended on how many syllables a word had. That's why I posted here looking for a method.

~Justin