大约有 30,000 项符合查询结果（耗时：0.0265秒） [XML]
PHP: How to remove all non printable characters in a string?
..., 127-255 and removes it.
8 bit extended ASCII?
You fell into a Hot Tub Time Machine, and you're back in the eighties.
If you've got some form of 8 bit ASCII, then you might want to keep the chars in range 128-255. An easy adjustment - just look for 0-31 and 127
$string = preg_replace('/[\x00-\...
PHP - concatenate or directly insert variables in string
...
Just pointing out on the performance: time php -r '$string=""; for ($i=0;$i<199999;$i++){ $string = $string.$i; } print("Done!\n");' (Concatenation) actually loses by about 300 milliseconds (for 200.000 items, that's 1 miliseconf per thousand elements on your ...
Regex (grep) for multi-line search needed [duplicate]
...
Your fundamental problem is that grep works one line at a time - so it cannot find a SELECT statement spread across lines.
Your second problem is that the regex you are using doesn't deal with the complexity of what can appear between SELECT and FROM - in particular, it omits comma...
TimeSpan ToString format
...
Try:
myTimeSpan.ToString("h'h 'm'm 's's'")
(Note that even spaces need to be quoted - that's what was wrong with my first attempt.)
I'm assuming you're using .NET 4, of course - before that, TimeSpan didn't support custom format ...
Getting the client's timezone offset in JavaScript
How can I gather the visitor's time zone information? I need the Timezone, as well as the GMT offset hours.
26 Answers
...
How to replace multiple white spaces with one white space
...
If you application isn't time critical, it can afford the 1 microsecond of processing overhead.
– Daniel
Aug 14 '09 at 20:13
16
...
Why is the shovel operator (
...nchmark'
Benchmark.bmbm do |x|
x.report('+= :') do
s = ""
10000.times { s += "something " }
end
x.report('<< :') do
s = ""
10000.times { s << "something " }
end
end
# Rehearsal ----------------------------------------
# += : 0.450000 0.010000 0.460000 ( 0...
Is there a way to access an iteration-counter in Java's for-each loop?
...d finalize. This not only loads CPU but also invalidates the cache all the time. Nothing like this is necessary for local variables. Why do you say that this is "the same"?
– Val
Sep 1 '13 at 14:03
...
Wait for a process to finish
...es that $pid has open files):
lsof -p $pid +r 1 &>/dev/null
With timeout (seconds)
Linux:
timeout $timeout tail --pid=$pid -f /dev/null
Darwin (requires that $pid has open files):
lsof -p $pid +r 1m%s -t | grep -qm1 $(date -v+${timeout}S +%s 2>/dev/null || echo INF)
...
An efficient compression algorithm for short text strings [closed]
...ssion algorithm will save space if the same substring is repeated multiple times in one input file (e.g. "the" in English text or "int" in C code.)
But in the case of URLs certain strings (e.g. "http://www.", ".com", ".html", ".aspx" will typically appear once in each input file. So you need to s...