大约有 47,000 项符合查询结果（耗时：0.0558秒） [XML]
Regex how to match an optional character
...
Use
[A-Z]?
to make the letter optional. {1} is redundant. (Of course you could also write [A-Z]{0,1} which would mean the same, but that's what the ? is there for.)
You could improve your regex to
^([0-9]{5})+\s+([A-Z]?)\s+([A-Z])([0-9]{3})([0-9]{3})([A-Z]{3})([A-...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
...
158
The documentation for Range† says this:
Ranges constructed using .. run from the beginni...
How to express infinity in Ruby?
...
188
If you use ruby 1.9.2, you can use:
>> Float::INFINITY #=> Infinity
>> 3 < ...
Generate random number between two numbers in JavaScript
Is there a way to generate a random number in a specified range (e.g. from 1 to 6: 1, 2, 3, 4, 5, or 6) in JavaScript?
23 A...
What's the (hidden) cost of Scala's lazy val?
...$0;
private String msg;
public String msg() {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
msg = "Lazy";
}
}
bitmap$0 = bitmap$0 | 1;
...
Difference between break and continue statement
...
21 Answers
21
Active
...
Python: print a generator expression?
...
163
Quick answer:
Doing list() around a generator expression is (almost) exactly equivalent to ha...
Splitting a list into N parts of approximately equal length
...
31 Answers
31
Active
...
How to pip install a package with min and max version range?
...
321
You can do:
$ pip install "package>=0.2,<0.3"
And pip will look for the best match, ass...
What is the fastest integer division supporting division by zero no matter what the result is?
...
107
Inspired by some of the comments I got rid of the branch on my Pentium and gcc compiler using
...