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Re: Re: Regex to add space after punctuation sign

by dda (Friar)
on Jan 08, 2004 at 09:52 UTC ( #319767=note: print w/replies, xml ) Need Help??

in reply to Re: Regex to add space after punctuation sign
in thread Regex to add space after punctuation sign

Thank you, Abigail. Can you please explain how does the replacement part of your expression work? If I understand correctly, /e evaluates $1 || "$2 " -- that way if $1 is not empty, it should not add second part?


P.S. I added end-of-line processings as was suggested by aragorn:
s/(\d[,.]\d)|([^\w\s](?!\s)(?!$))/$1 || "$2 "/ge;

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Re: Regex to add space after punctuation sign
by Abigail-II (Bishop) on Jan 08, 2004 at 09:58 UTC
    Evaluating $1 || "$2 " means you get $1 if $1 is true (which means, anytime \d[.,]\d matches), otherwise you get $2 (the punctation character), followed by a space.

    I would handle end-of-line processing as follows:

    s/(\d[,.]\d)|([^\w\s])(?=\S)/$1 || "$2 "/ge;
    A single positive look-ahead is, IMO, more clear than two negative look-aheads.


      Thank you. You are the best!


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[atcroft]: .oO(Then there is the effect if a site changes their timezone, such as when the International Date Line was moved by the purchase of Alaska by the US from Russia in 1867, or several places (I cannot recall off-hand) that moved from one side of the Date
[atcroft]: Line to the other recently....)
[atcroft]: .oO(Then again, you also have to be careful if you had it to the database, and be aware of any assumptions it makes (such as SQLite assuming Gregorian calendar and a day of exactly 86400 seconds)...)

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