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Check if a string matches a regex in Bash script
...a regex pattern.
For your specific case, you can write:
[[ $date =~ ^[0-9]{8}$ ]] && echo "yes"
Or more a accurate test:
[[ $date =~ ^[0-9]{4}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])$ ]] && echo "yes"
# |^^^^^^^^ ^^^^^^ ^^^^^^ ^^^^^^ ^^^^^^^^^^ ^^^^^^ |
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How to read the value of a private field from a different class in Java?
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answered Jul 28 '09 at 19:22
oxbow_lakesoxbow_lakes
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Which one will execute faster, if (flag==0) or if (0==flag)?
...-in, then both should take the same speed.
From the Wikipedia article on x86, I'd bet for a Jxx instruction for the if statement: perhaps a JNZ (Jump if Not Zero) or some equivalent.
I'd doubt the compiler misses such an obvious optimization, even with optimizations turned off. This is the type of...
How do I import a Swift file from another Swift file?
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Forge
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answered Jun 4 '14 at 18:56
H6.H6.
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how to programmatically fake a touch event to a UIButton?
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8 Answers
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Active
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WARNING: Can't verify CSRF token authenticity rails
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378
You should do this:
Make sure that you have <%= csrf_meta_tag %> in your layout
Add befo...
Can I call jquery click() to follow an link if I haven't bound an event handler to it with bind
...mannHoffmann
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How do I bottom-align grid elements in bootstrap fluid layout
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answered Jan 8 '13 at 20:36
Jeromy FrenchJeromy French
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Delete all lines beginning with a # from a file
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edited May 2 at 15:48
Vlad
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answered Nov 21...