Regex to Substring without cutting off word

I'm trying to figure out a regex which will act as a substring but not cut off words.  For example, I want to take a substring of 0 to x chars in a description but do not cut off any word.\

so something like give me 0 to x chars but cut off anything that's only one character toward the end type of deal so that I do not end up with a single character or soemthing else at the end of the description.
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dba123Asked:
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ozoCommented:
.{0,x}\b
0
ozoCommented:
.{0,x}(?!.$)
0

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