大约有 44,000 项符合查询结果（耗时：0.0633秒） [XML]
php Replacing multiple spaces with a single space [duplicate]
...
Use preg_replace() and instead of [ \t\n\r] use \s:
$output = preg_replace('!\s+!', ' ', $input);
From Regular Expression Basic Syntax Reference:
\d, \w and \s
Shorthand character classes matching
digits, word characters (letters,...
Why do we copy then move?
I saw code somewhere in which someone decided to copy an object and subsequently move it to a data member of a class. This left me in confusion in that I thought the whole point of moving was to avoid copying. Here is the example:
...
Dealing with commas in a CSV file
I am looking for suggestions on how to handle a csv file that is being created, then uploaded by our customers, and that may have a comma in a value, like a company name.
...
Why prefer two's complement over sign-and-magnitude for signed numbers?
...der to represent -1 in binary, two's complement is used: flipping the bits and adding 1?
18 Answers
...
EC2 instance types's exact network performance?
...
Bandwidth is tiered by instance size, here's a comprehensive answer:
For t2/m3/c3/c4/r3/i2/d2 instances:
t2.nano = ??? (Based on the scaling factors, I'd expect 20-30 MBit/s)
t2.micro = ~70 MBit/s (qiita says 63 MBit/s) - ...
Change column type from string to float in Pandas
I want to convert a table, represented as a list of lists, into a Pandas DataFrame . As an extremely simplified example:
9...
lexers vs parsers
Are lexers and parsers really that different in theory?
5 Answers
5
...
Why aren't variables declared in “try” in scope in “catch” or “finally”?
In C# and in Java (and possibly other languages as well), variables declared in a "try" block are not in scope in the corresponding "catch" or "finally" blocks. For example, the following code does not compile:
...
Should I use s and s inside my s?
...
the nav element and the list provide different semantical information:
The nav element communicates that we're dealing with a major navigation block
The list communicates that the links inside this navigation block form a list of items
...
String strip() for JavaScript? [duplicate]
What's a clean and efficient JavaScript implementation to strip leading and trailing spaces from a string?
8 Answers
...