in reply to Re^5: How to convert a string with regex to a string with a fixed length?
in thread How to convert a string with regex to a string with a fixed length?

Well, try something like 

s/$/                                                                  
+                                  /; s/^\(.\{1,100\}\).*/\1/;

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The first substitution has 100 or more spaces on the rhs.

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