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How to check if a string contains only digits in Java [duplicate]
In Java for String class there is a method called matches, how to use this method to check if my string is having only digits using regular expression. I tried with below examples, but both of them returned me false as result.
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Is it faster to count down than it is to count up?
...uction with a smaller binary encoding
If a previous instruction happens to set a flag (likely only on x86 family machines), you might not even need an explicit compare instruction
Are these differences likely to result in any measurable improvement on real programs on a modern out-of-order process...
Matplotlib scatter plot with different text at each data point
...ary to plot text without markers. In version 2.0 you'll need ax.scatter to set the proper range and markers for text.
y = [2.56422, 3.77284, 3.52623, 3.51468, 3.02199]
z = [0.15, 0.3, 0.45, 0.6, 0.75]
n = [58, 651, 393, 203, 123]
fig, ax = plt.subplots()
for i, txt in enumerate(n):
ax.annotat...
When should I make explicit use of the `this` pointer?
When should I explicitly write this->member in a method of
a class?
12 Answers
12...
How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
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This answer covers how to set up key authentication on a remote that uses OpenSSH format. But in order to use a Putty-generated key on a Linux client, this answer is insufficient. I followed the accepted answer and it worked splendidly.
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错误：缺少一个项目子类型。 子类型: 此安装不支持“{C089C8C0-30E0-4E22-8...
...子类型。 子类型: 此安装不支持“{C089C8C0-30E0-4E22-80C0-CE093F111A43}” 解决方法：下载安装Microsoft Visual Studio 2012 SDKhttp: www.microsoft.com en-us download confirmation.aspx?id=30668解决方法：下载安装
Microsoft Visual Studio 2012 SDK
http://www.microsoft.com/...
Generating all permutations of a given string
...caching any algorithm that outputs permutation is o(n!) because the result set to the permutation question is factorial to the input.
– jeremyjjbrown
Jan 2 '13 at 2:26
9
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Best way to replace multiple characters in a string?
...op on Python 2.7.14 and 3.6.3, and on a different machine from the earlier set, so cannot be compared directly.
╭────────────╥──────┬───────────────┬──────┬──────────────────...
How to get Vim to highlight non-ascii characters?
...trying to get Vim to highlight non-ASCII characters. Is there an available setting, regex search pattern, or plugin to do so?
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e.printStackTrace equivalent in python
...can do the following:
import logging
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
def f():
a = { 'foo': None }
# the following line will raise KeyError
b = a['bar']
def g():
f()
try:
g()
except Exception as e:
logger.error(str(e), exc_info=True)
And it w...