collection of variant of words using special symbols [closed]

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I am working on a project related to spam filtering. Many of you might be aware of this technique used by spammers:

1. writing "items" as "|tem" (pipe instead of i)
2. $ale instead of sale
3. h0t instead of hot (zero instead of letter 'o')

etc. etc.

I am wondering if there is a database available for all such possible variants of words using special symbols? Or does any one know about some good strategy to tackle this trick?

Currently what I have done is, I simply replace '@' with 'a', '|' with 'i', '$' with 's' and so on. I need your views on this issue! Please help.

Answer 1

It seems you are taking a message as a starting point and trying to transform it.

Another aproach could be to start by defining a list of words which are likely to be changed (sale, viagra, etc) and then generate all possible similar words. As a measure of similarity you can take a Levenshtein distance.