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Test whether string is a valid integer
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[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a literal "-"
The ? means "0 or 1 of the preceding (-)"
The + means "1 or more of the preceding ([0-9])"
The $ indicates the end of the input pattern
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Is \d not supported by grep's basic expressions?
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rogerdpack
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answered Aug 1 '11 at 16:08
DaenythDaenyth
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Easiest way to open a download window without navigating away from the page
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109
7 years have passed and
I don't know whether it works for IE6 or not, but this prompts OpenFile...
Check if a string matches a regex in Bash script
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330
You can use the test construct, [[ ]], along with the regular expression match operator, =~, to ...
Proxies with Python 'Requests' module
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10 Answers
10
Active
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Import pandas dataframe column as string not int
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Just want to reiterate this will work in pandas >= 0.9.1:
In [2]: read_csv('sample.csv', dtype={'ID': object})
Out[2]:
ID
0 00013007854817840016671868
1 00013007854817840016749251
2 00013007854817840016754630
3 00013007854817840016781876
4 00...
How do I apply a perspective transform to a UIView?
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330
As Ben said, you'll need to work with the UIView's layer, using a CATransform3D to perform the l...
How can I check the size of a collection within a Django template?
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MichielB
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answered May 23 '09 at 17:53
Alex MartelliAlex Mar...
jquery how to empty input field
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answered Feb 10 '12 at 23:36
shaunsantacruzshaunsantacruz
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PHP regular expressions: No ending delimiter '^' found in
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PHP regex strings need delimiters. Try:
$numpattern="/^([0-9]+)$/";
Also, note that you have a lower case o, not a zero. In addition, if you're just validating, you don't need the capturing group, and can simplify the regex to /^\d+$/.
Example: http://ideone.com/Ec3zh
See also:...