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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-...
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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;...
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RegEx - Match Numbers of Variable Length

... 135 {[0-9]+:[0-9]+} try adding plus(es) ...
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PHP: If internet explorer 6, 7, 8 , or 9

... 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.

... 147 Update data.table v1.9.6+ now supports OP's original attempt and the following answer is no lo...
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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

... | edited Apr 21 '19 at 19:48 Glorfindel 19k1111 gold badges6262 silver badges8585 bronze badges ...