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Regular expression to allow spaces between words
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tl;dr
Just add a space in your character class.
^[a-zA-Z0-9_ ]*$
Now, if you want to be strict...
The above isn't exactly correct. Due to the fact that * means zero or more, it would match all of the following cases that one would not usually mean to match:
An empty strin...
recursively add file extension to all files
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229
Alternative command without an explicit loop (man find):
find . -type f -exec mv '{}' '{}'.jpg ...
how to solve “ruby installation is missing psych” error?
I used rvm to install ruby 1.9.3. even though it was successfully installed, it complained about libyaml. and now every time i wanna install a gem (say rails) this warning shows up:
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Linux 搭建NTP时间同步服务器 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...化，从而达到时间统一。配置环境及要求：A、 假设10 8 9 0 NTP服务器【Network Time Protocol（NTP】是用来使计算机时间同步化的一种协议，NTP服务器可以对其它服务器做时间同步化，从而达到时间统一。
配置环境及要求：
A、 假...
Java: how can I split an ArrayList in multiple small ArrayLists?
...eger> numbers = new ArrayList<Integer>(
Arrays.asList(5,3,1,2,9,5,0,7)
);
List<Integer> head = numbers.subList(0, 4);
List<Integer> tail = numbers.subList(4, 8);
System.out.println(head); // prints "[5, 3, 1, 2]"
System.out.println(tail); // prints "[9, 5, 0, 7]"
Collectio...
Is there a way to access method arguments in Ruby?
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In Ruby 1.9.2 and later you can use the parameters method on a method to get the list of parameters for that method. This will return a list of pairs indicating the name of the parameter and whether it is required.
e.g.
If you do
d...
How to format a number 0..9 to display with 2 digits (it's NOT a date)
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answered Sep 14 '12 at 9:15
beny23beny23
30.8k33 gold badges7575 silver badges8383 bronze badges
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Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
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169
(For information about the new exception helper in Visual Studio 2017 see the end of this answer...
Regular expression to match any character being repeated more than 10 times
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9 Answers
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how to set cursor style to pointer for links without hrefs
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9 Answers
9
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