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Is there a regular expression to detect a valid regular expression?
...ion, such as PCRE, but that can't really be called regular expressions any more.
Indeed, a "recursive regular expression" is not a regular expression. But this an often-accepted extension to regex engines... Ironically, this extended regex doesn't match extended regexes.
"In theory, theory and...
What are good uses for Python3's “Function Annotations”
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It also reveals the Python influence on Swift even more.
– uchuugaka
Nov 3 '15 at 2:11
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How to add column if not exists on PostgreSQL?
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This approach (EXCEPTION) is a bit more general, and can be employed for tasks which have no IF NOT EXISTS syntax - for example ALTER TABLE ... ADD CONSTRAINT.
– Tomasz Gandor
Apr 16 '19 at 9:51
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How to set a Django model field's default value to a function call / callable (e.g., a date relative
...ls.Model):
my_date = models.DateTimeField(default=get_default_my_date)
More information in the @simanas answer below
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How to write DataFrame to postgres table?
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How can I use Python to get the system hostname?
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What command means “do nothing” in a conditional in Bash?
...ou are correct), it returns true (status 0) just like true does, and it is more difficult to read. Bash is a DevOps language, and if : is written by someone on my team, I'd have them change it.
– SaintHax
May 29 '17 at 19:51
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Using .otf fonts on web browsers
... to support nearly every browser that is still out there (not necessary anymore IMHO), you should add some more font-types like:
@font-face {
font-family: GraublauWeb;
src: url("webfont.eot"); /* IE9 Compat Modes */
src: url("webfont.eot?#iefix") format("embedded-opentype"), /* IE6-IE8 *...
Using semicolon (;) vs plus (+) with exec in find
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@Rmano: I've seen find (and xargs) on Solaris emit more arguments than could be consumed. The xargs (and find) in GNU's findutils` seem to behave more sensibly, but not everyone uses GNU.
– Johnsyweb
Nov 24 '13 at 1:55
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