The primary regex will match one particular whitespace character. The second regex will reluctantly match a number of whitespace figures. For many applications, both of these regexes are really identical, other than in the second circumstance, the regex can match far more on the string, if it prevents the regex match from failing. from

Applying %s in scanf without having an explcit subject width opens exactly the same buffer overflow exploit that will get did; specifically, if there are far more figures in the input stream as opposed to concentrate on buffer is sized to hold, scanf will happily produce those added figures to memory outdoors the buffer, most likely clobbering a little something essential. Regrettably, not like in printf, You cannot offer the sector with like a run time argument:

Cmd /S may be very beneficial because it will save you owning to worry about "quoting rates". Remember which the /C argument means "execute this command as though I had typed it with the prompt, then Stop".

Get paid badges by improving or inquiring questions in Staging Floor. See new badges What does %s and %d imply in printf within the C language? [shut]

And since your 2nd parameter is empty string "", there is no distinction between the output of two scenarios.

All those two replaceAll calls will usually produce a similar consequence, irrespective of what x is. Nonetheless, it's important to notice that the two frequent expressions are certainly not precisely the same:

The %s token makes it possible for me to insert (and probably structure) a string. Detect the %s token is changed by whatever I go to the string after the % image.

See also that I am using a tuple here in addition (when you have only just one string using a tuple is optional) to illustrate that numerous strings is usually inserted and formatted in one assertion.

then the string MY_COMMAND will likely be parsed specifically as if it have been typed in the command prompt. If you are taking command-line input with the user, or for anyone who is a library processing a command line supplied by an software, which is almost certainly a good idea. For instance, the C runtime library procedure() function could be carried out in this manner.

Why do important signatures swap from flats to sharps at a particular method brightness? additional sizzling inquiries

What I don't comprehend is once the quotation removing would crack nearly anything, mainly because that's the only time /s ("suppress the default estimate-removal behavior") might be needed. It only gets rid of quotes less than a specific arcane list of situations, and a type of ailments is that the initial character once the /c should be a quotation mark.

Utilizing scanf Using the %s conversion specifier will cease scanning at the 1st whitespace character; by way of example, If the enter stream seems like

What chemical things or minerals would wish to become existing in material streaming from Alpha Centauri to influence us that it did originate there?

What chemical factors or minerals would wish to get current in materials streaming from Alpha Centauri to persuade us check here that it did originate there?

This might be much more likely to be desirable from the scenario within the concern Michael Burr linked to, exactly where cmd.exe is currently being introduced by CreateProcess as an alternative to from the batch file or the command line alone..

Is there some subtlety to /s that is eluding me? When would it ever be needed? When wouldn't it even make any distinction?