Java: Java Programming For Beginners a simple Start To Java Programming (Written By a software Engineer)

Matches
Subexpression
Matches line beginning
^
Matches line end
$

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Matches  single  characters  except  for  the  newline
character
.
Matches single character in braces
[…]
Matches single character, which are not in braces
[^…]
String beginning
\A
String end
\z
String  end  except  for  the  final  line  terminating
character
\Z
Matches 0 or more instances of expression
re*
Matches 1 or more instances of the expression
re+
Matches 0 or 1 instances of expression.
re?
Matches exactly n of instances of expression.
re{ n}
Matches  n  or  more  instances  of  the  specified
expression.
re{ n,}
Matches minimum n and maximum m instances of the
expression.
re{ n, m}
Matches one of these: a or b.
a| b
Groups  regular  expressions.  The  matching  text  is
remembered.
(re)
Groups  regular  expressions.  The  text  is  not
remembered.
(?: re)
Matches  independent  pattern.  No  backtracking  is
supported.
(?> re)

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Matches characters in a word.
\w
Matches characters, which are non-word.
\W
Matches  whitespace.  These  characters  are  equivalent
to [\t\n\r\f].
\s
Matches space, which is non-whitespace.
\S
Matches digits. These are typically equal to 0 to 9.
\d
Matches non-digits.
\D
Matches string beginning.
\A
Matches  string  end  just  before  the  newline  character
appears.
\Z
Matches string end.
\z
Matches  the  point  where  the  last  matching  condition
was found.
\G
Group number n back-reference
\n
Matches  boundaries  of  the  word  when  used  without
brackets.  However,  backspace  is  matched  when  it  is
used inside brackets.
\b
Matches boundaries, which are non-word
\B
Matches carriage returns, newlines, and tabs
\n, \t, etc.
Escape all the characters until a \E is found
\Q
Ends any quotes that begin with \Q
\E
Methods of the Matcher Class
Index Methods:

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The following table gives a list of methods hat show correctly where the match was found
in the info string:
public int start(int bunch)
Furnishes  a  proportional  payback  record  of  the  subsequent  caught  by  the  given
group amid the past match operation.
public int begin()
Furnishes a proportional payback record of the past match.
public int end(int bunch)
Furnishes a proportional payback after the last character of the subsequent caught
by the given group amid the past match operation.
public int end()
Furnishes a proportional payback after the last character matched.