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Check if a string matches a regex in Bash script
...amp; echo "yes"
Or more a accurate test:
[[ $date =~ ^[0-9]{4}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])$ ]] && echo "yes"
# |^^^^^^^^ ^^^^^^ ^^^^^^ ^^^^^^ ^^^^^^^^^^ ^^^^^^ |
# | | ^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^ |
# | | | ...
When should I mock?
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124
A unit test should test a single codepath through a single method. When the execution of a met...
How can I extract a predetermined range of lines from a text file on Unix?
I have a ~23000 line SQL dump containing several databases worth of data. I need to extract a certain section of this file (i.e. the data for a single database) and place it in a new file. I know both the start and end line numbers of the data that I want.
...
Base64 Java encode and decode a string [duplicate]
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246
You can use following approach:
import org.apache.commons.codec.binary.Base64;
// Encode dat...
Python memory usage of numpy arrays
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246
You can use array.nbytes for numpy arrays, for example:
>>> import numpy as np
>&...
How does a hash table work?
...e come.
Say that the output of the hash algorithm is in the range of 0 to 20 and you get the value 17 from a particular title. If the size of the library is only 7 books, you count 1, 2, 3, 4, 5, 6, and when you get to 7, you start back at 0. Since we need to count 17 times, we have 1, 2, 3, 4, 5, ...
How to parse freeform street/postal address out of text, and into components
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294
I saw this question a lot when I worked for an address verification company. I'm posting the a...
chart.js load totally new data
...ySelector('#results-graph'); // why use jQuery?
ctx = canvas.getContext('2d');
ctx.canvas.width = $('#graph').width(); // resize to parent width
ctx.canvas.height = $('#graph').height(); // resize to parent height
var x = canvas.width/2;
var y = canvas.height/2;
ctx.font = '10pt Verdana...
Persistent invalid graphics state error when using ggplot2
...n't get reset. This worked for me and it's simpler than reinstalling ggplot2.
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