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How to atomically delete keys matching a pattern using Redis
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Starting with redis 2.6.0, you can run lua scripts, which execute atomically. I have never written one, but I think it would look something like this
EVAL "return redis.call('del', unpack(redis.call('keys', ARGV[1])))" 0 prefix:[YOUR_PREFIX e.g del...
Extract substring using regexp in plain bash
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Using pure bash :
$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt
another solution with bash regex :
$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[0-9]{2}) ]] &&
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How do you know when to use fold-left and when to use fold-right?
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105
You can transfer a fold into an infix operator notation (writing in between):
This example fol...
What are the minimum margins most printers can handle?
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Every printer is different but 0.25" (6.35 mm) is a safe bet.
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AWK: Access captured group from line pattern
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answered Jun 2 '10 at 12:50
Peter TillemansPeter Tillemans
33k99 gold badges7272 silver badges109109 bronze badges
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How do you make a WPF slider snap only to discrete integer positions?
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answered Oct 6 '08 at 2:10
Brian StewartBrian Stewart
8,4181010 gold badges4949 silver badges6565 bronze badges
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converting drawable resource image into bitmap
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409
You probably mean Notification.Builder.setLargeIcon(Bitmap), right? :)
Bitmap largeIcon = Bitm...
Get first day of week in PHP?
...e('m-d-Y', strtotime('+'.(6-$day).' days'));
$day contains a number from 0 to 6 representing the day of the week (Sunday = 0, Monday = 1, etc.).
$week_start contains the date for Sunday of the current week as mm-dd-yyyy.
$week_end contains the date for the Saturday of the current week as mm-dd-yyy...
Should one use < or
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The first is more idiomatic. In particular, it indicates (in a 0-based sense) the number of iterations. When using something 1-based (e.g. JDBC, IIRC) I might be tempted to use <=. So:
for (int i=0; i < count; i++) // For 0-based APIs
for (int i=1; i <= count; i++) // For 1-ba...
Generate random string/characters in JavaScript
...aracter string composed of characters picked randomly from the set [a-zA-Z0-9] .
77 Answers
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