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(base) MAC:Mon Oct 12:08:43:~> jshell
|  Welcome to JShell -- Version 14.0.1
|  For an introduction type: /help intro

jshell> /imports
|    import java.io.*
|    import java.math.*
|    import java.net.*
|    import java.nio.file.*
|    import java.util.*
|    import java.util.concurrent.*
|    import java.util.function.*
|    import java.util.prefs.*
|    import java.util.regex.*
|    import java.util.stream.*

jshell> Pattern p = Pattern.compile([a-z]);
|  Error:
|  illegal start of expression
|  Pattern p = Pattern.compile([a-z]);
|                              ^
|  Error:
|  ';' expected
|  Pattern p = Pattern.compile([a-z]);
|                                   ^

jshell> Pattern p = Pattern.compile("[a-z]");
p ==> [a-z]

jshell> Matcher m = p.match("4a3e5DX");
|  Error:
|  cannot find symbol
|    symbol:   method match(java.lang.String)
|  Matcher m = p.match("4a3e5DX");
|              ^-----^

jshell> Matcher m = p.matcher("4a3e5DX");
m ==> java.util.regex.Matcher[pattern=[a-z] region=0,7 lastmatch=]

jshell> p.group()
|  Error:
|  cannot find symbol
|    symbol:   method group()
|  p.group()
|  ^-----^

jshell> m.group()
|  Exception java.lang.IllegalStateException: No match found
|        at Matcher.group (Matcher.java:645)
|        at Matcher.group (Matcher.java:604)
|        at (#3:1)

jshell> p
p ==> [a-z]

jshell> m
m ==> java.util.regex.Matcher[pattern=[a-z] region=0,7 lastmatch=]

jshell> m.find()
$6 ==> true

jshell> m.groupCount()
$7 ==> 0

jshell> m.results().forEach(System.out::println)
java.util.regex.Matcher$ImmutableMatchResult@66cd51c3

jshell> m.reset()
$9 ==> java.util.regex.Matcher[pattern=[a-z] region=0,7 lastmatch=]

jshell> m.results().forEach(e -> System.out.printl(e.group()
   ...> ))
|  Error:
|  cannot find symbol
|    symbol:   method printl(java.lang.String)
|  m.results().forEach(e -> System.out.printl(e.group()
|                           ^---------------^

jshell> m.results().forEach(e -> System.out.println(e.group()
   ...> ))
a
e

jshell> p = Pattern.compile("[^a-z]");
p ==> [^a-z]

jshell> Matcher m = p.matches("ab&7234ABC");
|  Error:
|  method matches in class java.util.regex.Pattern cannot be applied to given types;
|    required: java.lang.String,java.lang.CharSequence
|    found:    java.lang.String
|    reason: actual and formal argument lists differ in length
|  Matcher m = p.matches("ab&7234ABC");
|              ^-------^

jshell> Matcher m = p.matcher("ab&7234ABC");
m ==> java.util.regex.Matcher[pattern=[^a-z] region=0,10 lastmatch=]

jshell> m.results().forEach(e -> System.out.println(e.group()));
&
7
2
3
4
A
B
C

jshell> p = Pattern.compile("[a-z][0-9]");
p ==> [a-z][0-9]

jshell> m = p.matcher("qui4nine8");
m ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,9 lastmatch=]

jshell> m.results.forEach(e -> System.out.println(e.group()));
|  Error:
|  cannot find symbol
|    symbol:   variable results
|  m.results.forEach(e -> System.out.println(e.group()));
|  ^-------^

jshell> m.results().forEach(e -> System.out.println(e.group()));
i4
e8

jshell> m.results().reset()
|  Error:
|  cannot find symbol
|    symbol:   method reset()
|  m.results().reset()
|  ^---------------^

jshell> m.reset()
$17 ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,9 lastmatch=]

jshell> m.results().map(e -> e.group()).forEach(System.out::println);
i4
e8

jshell> Pattern phone = Pattern.compile("[2-9]\\d\\d-[2-9]\\d\\d-\\d\\d\\d\\d");
phone ==> [2-9]\d\d-[2-9]\d\d-\d\d\d\d

jshell> s = "123-45-6789 201-666-5456 512-477-7899 foo bar baz"
|  Error:
|  cannot find symbol
|    symbol:   variable s
|  s = "123-45-6789 201-666-5456 512-477-7899 foo bar baz"
|  ^

jshell> String s = "123-45-6789 201-666-5456 512-477-7899 foo bar baz"
s ==> "123-45-6789 201-666-5456 512-477-7899 foo bar baz"

jshell> m = p.matcher(s);
m ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,49 lastmatch=]

jshell> m.results().map(e -> e.group()).forEach(System.out::println);

jshell> m.reset()
$23 ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,49 lastmatch=]

jshell> m.results().map(e -> e.group()).forEach(System.out::println);

jshell> m.reset()
$25 ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,49 lastmatch=]

jshell> m
m ==> java.util.regex.Matcher[pattern=[a-z][0-9] region=0,49 lastmatch=]

jshell> m.results()
$27 ==> java.util.stream.ReferencePipeline$Head@626b2d4a

jshell> p
p ==> [a-z][0-9]

jshell> m = p.matcher(phone);
|  Error:
|  incompatible types: java.util.regex.Pattern cannot be converted to java.lang.CharSequence
|  m = p.matcher(phone);
|                ^---^

jshell> phone
phone ==> [2-9]\d\d-[2-9]\d\d-\d\d\d\d

jshell> phone.matcher(s);
$30 ==> java.util.regex.Matcher[pattern=[2-9]\d\d-[2-9]\d\d-\d\d\d\d region=0,49 lastmatch=]

jshell> m = phone.matcher(s);
m ==> java.util.regex.Matcher[pattern=[2-9]\d\d-[2-9]\d ... \d region=0,49 lastmatch=]

jshell> m.results().map(e -> e.group()).forEach(System.out::println);
201-666-5456
512-477-7899

jshell> phone = Pattern.compile("[2-9]\\d{2}-[2-9]\\d{2}-\\d{4}")
phone ==> [2-9]\d{2}-[2-9]\d{2}-\d{4}

jshell> m = phone.matcher(s)
m ==> java.util.regex.Matcher[pattern=[2-9]\d{2}-[2-9]\ ... 4} region=0,49 lastmatch=]

jshell> m.results().map(e -> e.group()).forEach(System.out::println);
201-666-5456
512-477-7899

jshell> /exit
|  Goodbye
(base) MAC:Mon Oct 12:09:25:~>