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Regex how to match an optional character
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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-...
How to check if hex color is “too black”?
...rceived brightness.
Assuming a six character colour:
var c = c.substring(1); // strip #
var rgb = parseInt(c, 16); // convert rrggbb to decimal
var r = (rgb >> 16) & 0xff; // extract red
var g = (rgb >> 8) & 0xff; // extract green
var b = (rgb >> 0) & 0xff;...
RegEx - Match Numbers of Variable Length
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135
{[0-9]+:[0-9]+}
try adding plus(es)
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PHP: If internet explorer 6, 7, 8 , or 9
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17 Answers
17
Active
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What does [ N … M ] mean in C aggregate initializers?
From sys.c line 123:
1 Answer
1
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Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
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Searching for UUIDs in text with regex
...relying on the assumption that all UUIDs will follow a patttern of 8-4-4-4-12 hexadecimal digits.
16 Answers
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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
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147
Update
data.table v1.9.6+ now supports OP's original attempt and the following answer is no lo...
How can I setup & run PhantomJS on Ubuntu?
...ntomJS and recorded it to video: https://www.dailymotion.com/video/xnizmh_1_webcam
25 Answers
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Getting LaTeX into R Plots
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edited Apr 21 '19 at 19:48
Glorfindel
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