During my writing on a regular expression tutorial, I came up with random number generator which is useful for some testing cases, as well as in situations where a simple encryption algorithm is useful.

There are at least four modes of operation for such a generator thinkable:

Listed below are the variables needed for these four cases, and further down the respective implementation.

There are at least four modes of operation for such a generator thinkable:

- random bytes e.g. random binary output
- random text e.g. ASCII printable character subset of values (Dec 32-126), click here for a complete table
- variable, random output-length of text
- increasing or decreasing bias toward a given character with increasing text length

Listed below are the variables needed for these four cases, and further down the respective implementation.

- STRLEN, any integer defining the text length
- STRINGLENGTH replaced by (Math.random()*MAXLENGTH).toFixed()

Math.random() returns any 16bit float ranging from 1 as the upper boundary to 0.01 as the lower boundary. Some web- references cite from 1 to 0. However such a function would be much less useful, and is in fact not implemented. To get any random number within a given range just add the lower bound to it, whilst substracting it from the upperbound. Setting the upper boundary is always easy: it is simply the number you multiply with. It's default lower boundary will be 1% of that. For example 1) this means 0, 1 and 2 will never be encountered.(Math.random()*UPPERBOUND-LOWERBOUND).toFixed()+LOWERBOUND

Note: Likewise, a random text length between an upper and lower bound could be set - Refer to 2). Likewise, a random text length between an upper and lower bound could be set
- Refer to 2). The upperboundary is decremented by the running variable i, and the lower boundary incremented by i. The then resulting number is used to generate a character.