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## gnu.regexp
Class RESyntax

    java.lang.Object
      gnu.regexp.RESyntax

All Implemented Interfaces:
  java.io.Serializable

    public final class RESyntax

extends java.lang.Object
implements java.io.Serializable

An RESyntax specifies the way a regular expression will be compiled. This class provides a number of predefined useful constants for emulating popular regular expression syntaxes. Additionally the user may construct his or her own syntax, using any combination of the syntax bit constants. The syntax is an optional argument to any of the matching methods on class RE.

Author:
  Wes Biggs
See Also:
  Serialized Form

Field Summary
`static int` | `RE_BACKSLASH_ESCAPE_IN_LISTS` Syntax bit.
`static int` | `RE_BK_PLUS_QM` Syntax bit.
`static int` | `RE_CHAR_CLASS_ESC_IN_LISTS` Syntax bit.
`static int` | `RE_CHAR_CLASS_ESCAPES` Syntax bit.
`static int` | `RE_CHAR_CLASSES` Syntax bit.
`static int` | `RE_COMMENTS` Syntax bit.
`static int` | `RE_CONTEXT_INDEP_ANCHORS` Syntax bit. ^ and $ are special everywhere.
`static int` | `RE_CONTEXT_INDEP_OPS` Syntax bit.
`static int` | `RE_CONTEXT_INVALID_OPS` Syntax bit.
`static int` | `RE_DOT_NEWLINE` Syntax bit.
`static int` | `RE_DOT_NOT_NULL` Syntax bit.
`static int` | `RE_HAT_LISTS_NOT_NEWLINE` Syntax bit.
`static int` | `RE_INTERVALS` Syntax bit.
`static int` | `RE_LIMITED_OPS` Syntax bit.
`static int` | `RE_LOOKAHEAD` Syntax bit.
`static int` | `RE_NEWLINE_ALT` Syntax bit.
`static int` | `RE_NO_BK_BRACES` Syntax bit.
`static int` | `RE_NO_BK_PARENS` Syntax bit.
`static int` | `RE_NO_BK_REFS` Syntax bit.
`static int` | `RE_NO_BK_VBAR` Syntax bit.
`static int` | `RE_NO_EMPTY_RANGES` Syntax bit.
`static int` | `RE_PURE_GROUPING` Syntax bit.
`static int` | `RE_STINGY_OPS` Syntax bit.
`static int` | `RE_STRING_ANCHORS` Syntax bit.
`static RESyntax` | `RE_SYNTAX_AWK` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_ED` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_EGREP` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_EMACS` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_GREP` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_PERL4` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_PERL4_S` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_PERL5` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_PERL5_S` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_AWK` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_BASIC` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_EGREP` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_EXTENDED` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_MINIMAL_BASIC` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_POSIX_MINIMAL_EXTENDED` Predefined syntax.
`static RESyntax` | `RE_SYNTAX_SED` Predefined syntax.
`static int` | `RE_UNMATCHED_RIGHT_PAREN_ORD` Syntax bit.

Constructor Summary
`RESyntax()` Construct a new syntax object with all bits turned off.
`RESyntax(RESyntax other)` Construct a new syntax object with all bits set the same as the other syntax.

Method Summary
`RESyntax` | `clear(int index)` Clear a given bit in this syntax.
`boolean` | `get(int index)` Check if a given bit is set in this syntax.
`java.lang.String` | `getLineSeparator()` Returns the currently active line separator string.
`RESyntax` | `makeFinal()` Called internally when constructing predefined syntaxes so their interpretation cannot vary.
`RESyntax` | `set(int index)` Set a given bit in this syntax.
`RESyntax` | `setLineSeparator(java.lang.String aSeparator)` Changes the line separator string for regular expressions created using this RESyntax.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### RE_BACKSLASH_ESCAPE_IN_LISTS

    public static final int RE_BACKSLASH_ESCAPE_IN_LISTS

  Syntax bit. Backslash is an escape character in lists.

  See Also:
    Constant Field Values

### RE_BK_PLUS_QM

    public static final int RE_BK_PLUS_QM

  Syntax bit. Use \? instead of ? and \+ instead of +.

  See Also:
    Constant Field Values

### RE_CHAR_CLASSES

    public static final int RE_CHAR_CLASSES

  Syntax bit. POSIX character classes ([:...:]) in lists are allowed.

  See Also:
    Constant Field Values

### RE_CONTEXT_INDEP_ANCHORS

    public static final int RE_CONTEXT_INDEP_ANCHORS

  Syntax bit. ^ and $ are special everywhere. Not implemented.

  See Also:
    Constant Field Values

### RE_CONTEXT_INDEP_OPS

    public static final int RE_CONTEXT_INDEP_OPS

  Syntax bit. Repetition operators are only special in valid positions. Not implemented.

  See Also:
    Constant Field Values

### RE_CONTEXT_INVALID_OPS

    public static final int RE_CONTEXT_INVALID_OPS

  Syntax bit. Repetition and alternation operators are invalid at start and end of pattern and other places. Not implemented.

  See Also:
    Constant Field Values

### RE_DOT_NEWLINE

    public static final int RE_DOT_NEWLINE

  Syntax bit. Match-any-character operator (.) matches a newline.

  See Also:
    Constant Field Values

### RE_DOT_NOT_NULL

    public static final int RE_DOT_NOT_NULL

  Syntax bit. Match-any-character operator (.) does not match a null.

  See Also:
    Constant Field Values

### RE_INTERVALS

    public static final int RE_INTERVALS

  Syntax bit. Intervals ({x}, {x,}, {x,y}) are allowed.

  See Also:
    Constant Field Values

### RE_LIMITED_OPS

    public static final int RE_LIMITED_OPS

  Syntax bit. No alternation (|), match one-or-more (+), or match zero-or-one (?) operators.

  See Also:
    Constant Field Values

### RE_NEWLINE_ALT

    public static final int RE_NEWLINE_ALT

  Syntax bit. Newline is an alternation operator.

  See Also:
    Constant Field Values

### RE_NO_BK_BRACES

    public static final int RE_NO_BK_BRACES

  Syntax bit. Intervals use { } instead of \{ \}

  See Also:
    Constant Field Values

### RE_NO_BK_PARENS

    public static final int RE_NO_BK_PARENS

  Syntax bit. Grouping uses ( ) instead of \( \).

  See Also:
    Constant Field Values

### RE_NO_BK_REFS

    public static final int RE_NO_BK_REFS

  Syntax bit. Backreferences not allowed.

  See Also:
    Constant Field Values

### RE_NO_BK_VBAR

    public static final int RE_NO_BK_VBAR

  Syntax bit. Alternation uses | instead of \|

  See Also:
    Constant Field Values

### RE_NO_EMPTY_RANGES

    public static final int RE_NO_EMPTY_RANGES

  Syntax bit. Not implemented.

  See Also:
    Constant Field Values

### RE_UNMATCHED_RIGHT_PAREN_ORD

    public static final int RE_UNMATCHED_RIGHT_PAREN_ORD

  Syntax bit. An unmatched right parenthesis (')' or '\)', depending on RE_NO_BK_PARENS) will throw an exception when compiling.

  See Also:
    Constant Field Values

### RE_HAT_LISTS_NOT_NEWLINE

    public static final int RE_HAT_LISTS_NOT_NEWLINE

  Syntax bit. Not implemented.

  See Also:
    Constant Field Values

### RE_STINGY_OPS

    public static final int RE_STINGY_OPS

  Syntax bit. Stingy matching is allowed (+?, *?, ??, {x,y}?).

  See Also:
    Constant Field Values

### RE_CHAR_CLASS_ESCAPES

    public static final int RE_CHAR_CLASS_ESCAPES

  Syntax bit. Allow character class escapes (\d, \D, \s, \S, \w, \W).

  See Also:
    Constant Field Values

### RE_PURE_GROUPING

    public static final int RE_PURE_GROUPING

  Syntax bit. Allow use of (?:xxx) grouping (subexpression is not saved).

  See Also:
    Constant Field Values

### RE_LOOKAHEAD

    public static final int RE_LOOKAHEAD

  Syntax bit. Allow use of (?=xxx) and (?!xxx) apply the subexpression to the text following the current position without consuming that text.

  See Also:
    Constant Field Values

### RE_STRING_ANCHORS

    public static final int RE_STRING_ANCHORS

  Syntax bit. Allow beginning- and end-of-string anchors (\A, \Z).

  See Also:
    Constant Field Values

### RE_COMMENTS

    public static final int RE_COMMENTS

  Syntax bit. Allow embedded comments, (?#comment), as in Perl5.

  See Also:
    Constant Field Values

### RE_CHAR_CLASS_ESC_IN_LISTS

    public static final int RE_CHAR_CLASS_ESC_IN_LISTS

  Syntax bit. Allow character class escapes within lists, as in Perl5.

  See Also:
    Constant Field Values

### RE_SYNTAX_AWK

    public static final RESyntax RE_SYNTAX_AWK

  Predefined syntax. Emulates regular expression support in the awk utility.

### RE_SYNTAX_ED

    public static final RESyntax RE_SYNTAX_ED

  Predefined syntax. Emulates regular expression support in the ed utility.

### RE_SYNTAX_EGREP

    public static final RESyntax RE_SYNTAX_EGREP

  Predefined syntax. Emulates regular expression support in the egrep utility.

### RE_SYNTAX_EMACS

    public static final RESyntax RE_SYNTAX_EMACS

  Predefined syntax. Emulates regular expression support in the GNU Emacs editor.

### RE_SYNTAX_GREP

    public static final RESyntax RE_SYNTAX_GREP

  Predefined syntax. Emulates regular expression support in the grep utility.

### RE_SYNTAX_POSIX_AWK

    public static final RESyntax RE_SYNTAX_POSIX_AWK

  Predefined syntax. Emulates regular expression support in the POSIX awk specification.

### RE_SYNTAX_POSIX_BASIC

    public static final RESyntax RE_SYNTAX_POSIX_BASIC

  Predefined syntax. Emulates POSIX basic regular expression support.

### RE_SYNTAX_POSIX_EGREP

    public static final RESyntax RE_SYNTAX_POSIX_EGREP

  Predefined syntax. Emulates regular expression support in the POSIX egrep specification.

### RE_SYNTAX_POSIX_EXTENDED

    public static final RESyntax RE_SYNTAX_POSIX_EXTENDED

  Predefined syntax. Emulates POSIX extended regular expression support.

### RE_SYNTAX_POSIX_MINIMAL_BASIC

    public static final RESyntax RE_SYNTAX_POSIX_MINIMAL_BASIC

  Predefined syntax. Emulates POSIX basic minimal regular expressions.

### RE_SYNTAX_POSIX_MINIMAL_EXTENDED

    public static final RESyntax RE_SYNTAX_POSIX_MINIMAL_EXTENDED

  Predefined syntax. Emulates POSIX extended minimal regular expressions.

### RE_SYNTAX_SED

    public static final RESyntax RE_SYNTAX_SED

  Predefined syntax. Emulates regular expression support in the sed utility.

### RE_SYNTAX_PERL4

    public static final RESyntax RE_SYNTAX_PERL4

  Predefined syntax. Emulates regular expression support in Larry Wall's perl, version 4,

### RE_SYNTAX_PERL4_S

    public static final RESyntax RE_SYNTAX_PERL4_S

  Predefined syntax. Emulates regular expression support in Larry Wall's perl, version 4, using single line mode (/s modifier).

### RE_SYNTAX_PERL5

    public static final RESyntax RE_SYNTAX_PERL5

  Predefined syntax. Emulates regular expression support in Larry Wall's perl, version 5.

### RE_SYNTAX_PERL5_S

    public static final RESyntax RE_SYNTAX_PERL5_S

  Predefined syntax. Emulates regular expression support in Larry Wall's perl, version 5, using single line mode (/s modifier).

Constructor Detail

### RESyntax

    public RESyntax()

  Construct a new syntax object with all bits turned off. This is equivalent to RE_SYNTAX_EMACS.

### RESyntax

    public RESyntax(RESyntax other)

  Construct a new syntax object with all bits set the same as the other syntax.

Method Detail

### makeFinal

    public RESyntax makeFinal()

  Called internally when constructing predefined syntaxes so their interpretation cannot vary. Conceivably useful for your syntaxes as well. Causes IllegalAccessError to be thrown if any attempt to modify the syntax is made.

  Returns:
    this object for convenient chaining

### get

    public boolean get(int index)

  Check if a given bit is set in this syntax.

### set

    public RESyntax set(int index)

  Set a given bit in this syntax.

  Parameters:
    `index` - the constant (RESyntax.RE_xxx) bit to set.
  Returns:
    a reference to this object for easy chaining.

### clear

    public RESyntax clear(int index)

  Clear a given bit in this syntax.

  Parameters:
    `index` - the constant (RESyntax.RE_xxx) bit to clear.
  Returns:
    a reference to this object for easy chaining.

### setLineSeparator

    public RESyntax setLineSeparator(java.lang.String aSeparator)

  Changes the line separator string for regular expressions created using this RESyntax. The default separator is the value returned by the system property "line.separator", which should be correct when reading platform-specific files from a filesystem. However, many programs may collect input from sources where the line separator is differently specified (for example, in the applet environment, the text box widget interprets line breaks as single-character newlines, regardless of the host platform. Note that setting the line separator to a character or characters that have specific meaning within the current syntax can cause unexpected chronosynclastic infundibula.

  Returns:
    this object for convenient chaining

### getLineSeparator

    public java.lang.String getLineSeparator()

  Returns the currently active line separator string. The default is the platform-dependent system property "line.separator".

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