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Why did Rust go with "match" instead of "switch" or "case"?


Why did Rust go with "match" instead of "switch" or "case"?

By : User
Date : November 21 2020, 11:01 PM
it fixes the issue The Rust Reference cites Standard ML (SML) and OCaml as an influence for pattern matching. In OCaml, pattern matching uses the match keyword.
The original Rust compiler was written in OCaml, so it makes sense that OCaml would have had a stronger influence on Rust than, say, Haskell.
code :


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.Net RegEx match pattern "aebecea" / "aebeceb"/ "aebecec" / "beceaec"

.Net RegEx match pattern "aebecea" / "aebeceb"/ "aebecec" / "beceaec"


By : A4est
Date : March 29 2020, 07:55 AM
around this issue You're getting the first match of [abc][e] in the first group, but you want to wrap some parens around the entire group you're capturing. Also, you can use ?: to make the inner group non-capturing. This should give the result you're looking for:
code :
((?:[abc][e])+)([abc])
Symfony2 "Parameter "" for route "" must match "[^/]++" ("" given) to gener

Symfony2 "Parameter "" for route "" must match "[^/]++" ("" given) to gener


By : user3163318
Date : March 29 2020, 07:55 AM
seems to work fine Like @Coussinsky said, some values for your field "nom" are empty on your database.
You could make this parameter to null if you want, or just change the empty values on your database.
Perl-compatible regular expressions to match upper case ",", space and "(" ")"

Perl-compatible regular expressions to match upper case ",", space and "(" ")"


By : jonesy10000
Date : March 29 2020, 07:55 AM
With these it helps I am trying to remove the SQL statements from a QString. All the SQL instructions are upper case. I want to have only the column names which are all lowercase with underscore as space in their names. As a sample the QString might contain: , You can use
code :
[^\WA-Z]+
QRegularExpression re("[^\\WA-Z]+");
QString subject("YOUR_STRING");
QRegularExpressionMatchIterator i = re.globalMatch(subject);
while (i.hasNext()) {
    QRegularExpressionMatch match = i.next();
    qDebug() <<  "CAPTURED: " << match.captured(0); // Print match value
    //...
}
is Rust's "match" as fast as C's "switch" for bytes?

is Rust's "match" as fast as C's "switch" for bytes?


By : Caitlin Annette
Date : March 29 2020, 07:55 AM
wish helps you LLVM does what it thinks is fastest with match. Sometimes that's a jump table, sometimes it's not. It depends on the exact match, including how many features of match you're using. (Like @, if, and anything else.)
Regexp help: match "John" or "Mike" or "Henry" but not "Johnny"

Regexp help: match "John" or "Mike" or "Henry" but not "Johnny"


By : Pat
Date : March 29 2020, 07:55 AM
With these it helps I would like to match John or Mike or Henry but not Johnny. , Add a negative lookahead to exclude Johnny:
code :
preg_match("/^(?!.*Johnny)(?=.*(?:John|Mike|Henry)).*$/", $TEXT)
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