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How to check if a string contains only digits in Java [duplicate]
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347
Try
String regex = "[0-9]+";
or
String regex = "\\d+";
As per Java regular expressions, t...
Cannot import XSSF in Apache POI
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edited Jan 21 '15 at 17:41
Gagravarr
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answere...
How do you delete a column by name in data.table?
... copy of it), Methods 1, 2a, and 2b are really the best options.
# Method 4:
df3[, .SD, .SDcols = !patterns("^foo$")]
Lastly there are approaches using with=FALSE, though data.table is gradually moving away from using this argument so it's now discouraged where you can avoid it; showing here so...
Convert string in base64 to image and save on filesystem in Python
I have a string in base64 format, which represents PNG image. Is there a way to save this image to the filesystem, as a PNG file?
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Get user info via Google API
...inav Manchanda
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How to hide a in a menu with CSS?
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edited Aug 22 '13 at 15:54
answered Feb 10 '12 at 21:14
Ry...
Secure hash and salt for PHP passwords
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14 Answers
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How can I easily convert DataReader to List? [duplicate]
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edited Nov 7 '19 at 14:59
answered Sep 23 '09 at 10:28
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How can I kill a process by name instead of PID?
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edited Jun 27 '14 at 17:08
joshtch
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answered Oct 2 '08 at 4:58
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Delete a line in Eclipse
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edited Mar 4 at 21:11
Amr Lotfy
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a...