Question

I am looking for a hashing function that is case insensitive and ignores white spaces as well.

for example:

the hash value generated for this is a hash and ThisIsAHash will be exactly the same.

does any such hash function exist?

Answer 1

Hash Functions are how we make them. For example:

First, for all strings ->

Step1. Lowercase them (or Uppercase them)
Step2. Strip all Whitespaces.

By now, both strings would map to: thisisahash

Step3. Now, apply any Hash function to it: crc32, java’s polynomial or whatever…

Given a string, you can always now do a lookup and see if other Strings are hashed to the same key.

Note that hash functions are one-way. So doing Step1 and Step2 don’t count against valid hash methods.