The very first regex will match one particular whitespace character. The next regex will reluctantly match a number of whitespace people. For the majority of purposes, both of these regexes are incredibly very similar, other than in the second scenario, the regex can match much more of the string, if it stops the regex match from failing. from

Applying %s in scanf without an explcit discipline width opens a similar buffer overflow exploit that will get did; specifically, if you will discover more characters during the input stream in comparison to the target buffer is sized to carry, scanf will happily produce These further people to memory outside the house the buffer, perhaps clobbering a little something vital. Regretably, in contrast to in printf, you can't offer the field with as a run time argument:

@Ben here's an illustration of outter prices, detect that /S does very little in that condition Try it pastebin.com/raw.

Home windows, which derives eventually from CP/M and VAX, isn't going to use this system internally. Towards the functioning procedure, the command line is just just one string of people.

The width is not specified in the format string, but as an additional integer value argument preceding the argument that needs to be formatted.

Those people two replaceAll phone calls will often generate the identical outcome, regardless of what x is. Having said that, it is crucial to note which the two standard expressions usually are not exactly the same:

Like that it could stand on its own. Delivering an instance which was reminiscent of the example in the problem would also be a moreover.

so "indent" specifies just how much Area to allocate for that string that follows it inside the parameter listing.

then the string MY_COMMAND might be parsed exactly as if it were typed in the command prompt. If you're taking command-line input in the user, or if you are a library processing a command line provided by an software, which is in all probability a good suggestion. One example is, the C runtime library process() purpose could possibly be carried out in this way.

Why do important signatures change from flats to sharps at a particular method brightness? additional warm questions

This executes SomeCommand.exe redirecting typical output to the temp file and conventional mistake to a similar put:

The kernel does not have the luxurious of the libc library to take care of the Preliminary arrange of various sources.

First off you'll want to realize that final output of the two the statements will probably be exact i.e. to get rid of all of the Areas from provided string.

So if you have a sophisticated command which you want to move to CMD.exe you either have to recollect CMD's argument quoting guidelines, and adequately escape most of the quotes, or use /S, which triggers a Unique non-parsing rule of "Strip very first and previous " and handle all other figures since the command to execute unchanged".

Nonetheless x.replaceAll("s+", ""); will probably be extra website productive way of trimming Areas (if string might have a number of contiguous Areas) since of doubtless much less no of replacements owing the to proven fact that regex s+ matches one or maybe more spaces simultaneously and replaces them with vacant string.

Is there some subtlety to /s which is eluding me? When would it not ever be vital? When would it not even make any variation?