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What's the state of the art in email validation for Rails?
...ed from http://www.regular-expressions.info/email.html -- which you should read if you really want to know all the tradeoffs. If you want a more correct and much more complicated fully RFC822-compliant regex, that's on that page too. But the thing is this: you don't have to get it totally right. ...
Strip Leading and Trailing Spaces From Java String
...with all leading and trailing whitespace removed. The javadoc for the same reads :
/**
* Returns a string whose value is this string, with all leading
* and trailing {@link Character#isWhitespace(int) white space}
* removed.
* <p>
* If this {@code String} object represents an empty strin...
How do I return rows with a specific value first?
... stupid to process equivalency tests" is simply wrong. If at all it should read: "does not support MySQL's implicit casting of boolean true to the value 1 (one)."
– a_horse_with_no_name
Sep 25 '13 at 15:02
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How can I have linked dependencies in a git repo?
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read this to know what a submodule is good for and the ways to workaround potential issues. and a discussion about it.
– minghua
Jun 11 '16 at 18:15
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How to define two angular apps / modules in one page?
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luisperezphd: I read your blog post. Is there any way to nest apps (e.g. a widget builder with an AJAX loaded widget) or detect if a page already has an app and inject another app as a dependency of the first? I just posted my question here ...
Excluding directories in os.walk
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... an alternative form of @unutbu's excellent answer that reads a little more directly, given that the intent is to exclude directories, at the cost of O(n**2) vs O(n) time.
(Making a copy of the dirs list with list(dirs) is required for correct execution)
# exclude = set([...])
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How do you switch pages in Xamarin.Forms?
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Seems like this thread is very popular and it will be sad not to mention here that there is an alternative way - ViewModel First Navigation. Most of the MVVM frameworks out there using it, however if you want to understand what it is about, co...
Disable all table constraints in Oracle
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Warning: if you have already DISABLED contraints, all constraints will be activated using that PL/SQL procedure. You have to filter those contraints on the where to ensure they keep disabled.
– nachouve
Nov 24...
Can I export a variable to the environment from a bash script without sourcing it?
...re are several possible workarounds.
The most obvious one, which you've already mentioned, is to use source or . to execute the script in the context of the calling shell:
$ cat set-vars1.sh
export FOO=BAR
$ . set-vars1.sh
$ echo $FOO
BAR
Another way is to have the script, rather than setting ...
Find the files existing in one directory but not in the other [closed]
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It also insists on reading file contents, and is therefore nearly useless with >>1GB directories.
– Tomislav Nakic-Alfirevic
Feb 4 '18 at 21:43
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