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What is the difference between square brackets and parentheses in a regex?
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These regexes are equivalent (for matching purposes):
/^(7|8|9)\d{9}$/
/^[789]\d{9}$/
/^[7-9]\d{9}$/
The explanation:
(a|b|c) is a regex "OR" and means "a or b or c", although the presence of brackets, necessary for the OR, also captures the digit. To be strictly equivalent, you...
Java 8 functional interface with no arguments and no return value
What is the Java 8 functional interface for a method that takes nothing and returns nothing?
3 Answers
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Adjusting Eclipse console size
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0xCursor
2,21844 gold badges1212 silver badges2828 bronze badges
answered Apr 8 '10 at 14:29
MelMel
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Where should Rails 3 custom validators be stored?
...w if there's some gem/config you need to add for this, but under rails 3.2.8 this doesn't work. Specifically, simply dropping your validator into app/validators/???.rb doesn't work.
– Doug
Aug 28 '12 at 6:22
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Convert floats to ints in Pandas?
...ype "in place" ?
– Mr_and_Mrs_D
Dec 8 '17 at 18:39
1
@EdChum, is there a way to prevent Pandas fr...
Differences between Java 8 Date Time API (java.time) and Joda-Time
...d a thread about the differences between the java.time API (new in Java 8 , defined by JSR 310 ) and Joda-Time .
3 Ans...
How to create a static library with g++?
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answered May 10 '11 at 8:16
user2100815user2100815
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How do I convert a String to an InputStream in Java?
...eam = new ByteArrayInputStream(exampleString.getBytes(StandardCharsets.UTF_8));
Note that this assumes that you want an InputStream that is a stream of bytes that represent your original string encoded as UTF-8.
For versions of Java less than 7, replace StandardCharsets.UTF_8 with "UTF-8".
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cmake and libpthread
...link_libraries(my_app PRIVATE Threads::Threads)
If you are using CMake 2.8.12+, you can simplify this to:
find_package(Threads REQUIRED)
if(THREADS_HAVE_PTHREAD_ARG)
target_compile_options(my_app PUBLIC "-pthread")
endif()
if(CMAKE_THREAD_LIBS_INIT)
target_link_libraries(my_app "${CMAKE_THREA...
How do I convert a Vector of bytes (u8) to a string
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To convert a slice of bytes to a string slice (assuming a UTF-8 encoding):
use std::str;
//
// pub fn from_utf8(v: &[u8]) -> Result<&str, Utf8Error>
//
// Assuming buf: &[u8]
//
fn main() {
let buf = &[0x41u8, 0x41u8, 0x42u8];
let s = match str::fro...