How to generate random string from specific pattern?

[hack3rcon]

Hello.
How can I generate random string from a specific pattern? For example, My pattern is "Hey, Hello World!" and I want generate it randomly. Something like:

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Hello World! Hey, Hello, Hey World!


Thanks.

[Bloom]

Not exactly random, but perhaps this helps?

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echo "Hey, Hello World!" | tr ' ' '\n' | shuf | tr '\n' ' '


[hack3rcon]

Not exactly random, but perhaps this helps?

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echo "Hey, Hello World!" | tr ' ' '\n' | shuf | tr '\n' ' '


Thanks.
How can I generate it to a certain number?

[Bloom]

This will shuffle the words in the sentence you specify, so the total length will always be the same.
The following code will give you actual random alphanumeric characters en here you can specify the length:

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strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 8 | tr -d '\n'; echo;


This will yield a 8 character response. If you want a different number, just replace the 8 with the number wanted.