Regex to wrap lines to 75 characters.

s/(?=.{75,})(?:(.{0,75})(?:\r\n?|\n\r?)|(.{0,75}))[ ]/\1\2\n /g
With thanks to dew on Efnet's #regex, back in 2005. This version indents subsequent lines after the first by one space, to make paragraphs visibly obvious -- remove the \3 to prevent this behavior. Lines are only broken at spaces: long strings with no spaces will not wrap, so URLs are safe. Replace the "75"s to make the regex linewrap to other amounts. From the unix commandline, "fold" is likely your better choice, but this snippet is handy in editors which allow regular expressions, in scripting, and other such situations where "fold" is unavailable.
Sample Output
Input:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. http://www.reallylongurl.example.com/I/wonder/why/URLs/are/so/long/sometimes/flibble/di/woo Sed sem turpis, mattis id consectetur ac, ornare at elit. Morbi sollicitudin tincidunt consequat. Nulla at auctor ligula. Nullam iaculis consequat justo, non vulputate massa placerat non. Sed in sem in dui hendrerit pretium vel in orci. Etiam rutrum suscipit imperdiet. Nam ornare sodales diam vel varius.

Output:

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
 http://www.reallylongurl.example.com/I/wonder/why/URLs/are/so/long/sometimes/flibble/di/woo
 Sed sem turpis, mattis id consectetur ac, ornare at elit. Morbi
 sollicitudin tincidunt consequat. Nulla at auctor ligula. Nullam iaculis
 consequat justo, non vulputate massa placerat non. Sed in sem in dui
 hendrerit pretium vel in orci. Etiam rutrum suscipit imperdiet. Nam ornare
 sodales diam vel varius.


0
2012-02-28 02:27:20

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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