Quantum Computing Experience
Opportunity for Quantum Computing class - Applicants will be accepted on a rolling basis in two rounds, beginning October 9 and October 15, so the time is right to apply right now.
This opportunity is open for free to high school students and above and is provided by a combination of MIT, Oxford University and IBM's open source Qiskit open source quantum software development kit.
Article announcing the program: The announcement
Java Updates
Java 15 has been released. The easiest way to get it is to go to adoptopenjdk.net which has an easy-to-use installer for all platforms. Java 15 supports Python-style triple-quoted strings. If you update to this, also update JavaFX to 15. You are fine if you have 13 or later.
I have updated the JavaFX instructions in the resources area. Get this installed and tested; there are complete instructions for all platforms.
Homework Get this working.
Java Regexes
These are implemented in the package java.util.regex. Here are the
contents.
| Item | Description |
|---|---|
MatchResult | This interface specifies two versions of
each of the methods start(), group(), and end().
|
Matcher | This class implements MatchResult
and it performs match operations based on a Pattern. |
Pattern | This class has a static method compile,
which works much like Python's re.compile() It has an instance
method matcher(String s) which returns a Matcher for the
regex in the Pattern for the string s. |
PatternSyntaxException | This is a runtime exception thrown when there is a syntax error in a regex pattern. |
Quick Review of Regexes
List Character Classes This is the most basic type of character wildcard.
[abcqf] - character wildcard matches any of a b c q f [a-z] - any lowercase letter ( - is a metacharacter herre) [A-Z] - any uppercase letter [0-9] - any decimal digit [0-9a-fA-F] - any hex digit. Metchars - is a range \ toggles magic ^ at the beginning is NOT, [ and ] [^a-z] - anything BUT a-z.
Character Classes
\d any decimal digit [0-9] \D anything but a deciaml digit \w any word character [a-zA-Z0-9_] \W anything BUT a word character . any character except newline \s any whitespace \S any non-whitespace
Juxtapositoin means "and then immediately"
[a-z][0-9]
US Phone numbers [2-9]\d\d-[2-9]\d\d-\d\d\d\d
Multiplicity Operators These are postfix unary operators and they have greater precedence than juxtaposition.
* zero or more of
+ one or more of
? one or none
{n} exactly n of
{n,} at least n of
{m, n} at least m but not more than n of
US Phone numbers
[2-9]\\d{2}-[2-9]\\d{2}-\\d{4}
Social security number
\\d{3}-\\d{2}-\\d{4}