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Environment variable substitution in sed
...iter
for example:
try to replace URL as $url (has : / in content)
x.com:80/aa/bb/aa.js
in string $tmp
<a href="URL">URL</a>
a. use / as delimiter
echo ${url//\//\\/}
x.com:80\/aa\/bb\/aa.js
echo ${url//\//\/}
x.com:80/aa/bb/aa.js
echo "${url//\//\/}"
x.com:80\/aa\/bb\/aa.js
echo $tm...
RegEx for matching UK Postcodes
...s from the XML slightly, as a P character in third position in format A9A 9AA is allowed by the definition given.
The RegEx supplied by the UK Government was:
([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9][A-...
How do you validate a URL with a regular expression in Python?
...:(?:\d+))?
))?/(?:(?:(?:(?:(?:(?:(?:[a-zA-Z\d]|%(?:3\d|[46][a-fA-F\d]|[57][Aa\d])
)|(?:%20))+|(?:OID|oid)\.(?:(?:\d+)(?:\.(?:\d+))*))(?:(?:%0[Aa])?(?:%2
0)*)=(?:(?:%0[Aa])?(?:%20)*))?(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F
\d]{2}))*))(?:(?:(?:%0[Aa])?(?:%20)*)\+(?:(?:%0[Aa])?(?:%20)*)(?:(?:(?
:(?:(...
C# Regex for Guid
...e all equivalent and acceptable formats for a GUID.
ca761232ed4211cebacd00aa0057b223
CA761232-ED42-11CE-BACD-00AA0057B223
{CA761232-ED42-11CE-BACD-00AA0057B223}
(CA761232-ED42-11CE-BACD-00AA0057B223)
Update 1
@NonStatic makes the point in the comments that the above regex will match false positi...
Why doesn't this code simply print letters A to Z?
...on character variables and not C's.
For example, in Perl 'Z'+1 turns into 'AA', while in C 'Z'+1 turns into '[' ( ord('Z') == 90, ord('[') == 91 ).
Note that character variables can be incremented but not decremented and even so only plain ASCII characters (a-z and A-Z) are supported.
From Comments...
Difference between InvariantCulture and Ordinal string comparison
...ccent difference is then considered before an earlier case difference, so "Aaba" < "aába".
– Rob Parker
Jan 18 '13 at 1:03
...
Scala: Abstract types vs generics
...assume you need to establish a pattern with three connected traits:
trait AA[B,C]
trait BB[C,A]
trait CC[A,B]
in the way that arguments mentioned in type parameters are AA,BB,CC itself respectfully
You may come with some kind of code:
trait AA[B<:BB[C,AA[B,C]],C<:CC[AA[B,C],B]]
trait BB[C...
Numpy first occurrence of value greater than existing value
...
This is a little faster (and looks nicer)
np.argmax(aa>5)
Since argmax will stop at the first True ("In case of multiple occurrences of the maximum values, the indices corresponding to the first occurrence are returned.") and doesn't save another list.
In [2]: N = 10000
...
Remove all spaces from a string in SQL Server
...
from #t
Result
IN OUT
===================
"a a " "aa"
"a a " "aa"
" a a " "aa"
" a a " "aa"
"a a" "aa"
"a a " "aa"
" a a" "aa"
" a a " "aa"
shar...
Combine two or more columns in a dataframe into a new column with a new name
...
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb FALSE 3 bb
# 3 5 cc TRUE 5 cc
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