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162 lines
9.1 KiB
162 lines
9.1 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qvalidator.cpp:517 -->
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<title>QRegExpValidator Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QRegExpValidator Class Reference</h1>
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<p>The QRegExpValidator class is used to check a string
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against a regular expression.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qvalidator-h.html">qvalidator.h</a>></tt>
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<p>Inherits <a href="qvalidator.html">QValidator</a>.
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<p><a href="qregexpvalidator-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QRegExpValidator"><b>QRegExpValidator</b></a> ( QObject * parent, const char * name = 0 )</li>
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<li class=fn><a href="#QRegExpValidator-2"><b>QRegExpValidator</b></a> ( const QRegExp & rx, QObject * parent, const char * name = 0 )</li>
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<li class=fn><a href="#~QRegExpValidator"><b>~QRegExpValidator</b></a> ()</li>
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<li class=fn>virtual QValidator::State <a href="#validate"><b>validate</b></a> ( QString & input, int & pos ) const</li>
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<li class=fn>void <a href="#setRegExp"><b>setRegExp</b></a> ( const QRegExp & rx )</li>
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<li class=fn>const QRegExp & <a href="#regExp"><b>regExp</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QRegExpValidator class is used to check a string
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against a <a href="qregexp.html#regular-expression">regular expression</a>.
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<p>
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<p> QRegExpValidator contains a regular expression, "regexp", used to
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determine whether an input string is <a href="qvalidator.html#State-enum">Acceptable</a>, <a href="qvalidator.html#State-enum">Intermediate</a> or <a href="qvalidator.html#State-enum">Invalid</a>.
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<p> The regexp is treated as if it begins with the start of string
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assertion, <b>^</b>, and ends with the end of string assertion
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<b>$</b> so the match is against the entire input string, or from
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the given position if a start position greater than zero is given.
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<p> For a brief introduction to Qt's regexp engine see <a href="qregexp.html">QRegExp</a>.
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<p> Example of use:
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<pre>
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// regexp: optional '-' followed by between 1 and 3 digits
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<a href="qregexp.html">QRegExp</a> rx( "-?\\d{1,3}" );
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<a href="qvalidator.html">QValidator</a>* validator = new QRegExpValidator( rx, this );
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<a href="qlineedit.html">QLineEdit</a>* edit = new <a href="qlineedit.html">QLineEdit</a>( this );
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edit-><a href="qlineedit.html#setValidator">setValidator</a>( validator );
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</pre>
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<p> Below we present some examples of validators. In practice they would
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normally be associated with a widget as in the example above.
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<p> <pre>
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// integers 1 to 9999
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<a href="qregexp.html">QRegExp</a> rx( "[1-9]\\d{0,3}" );
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// the validator treats the regexp as "^[1-9]\\d{0,3}$"
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QRegExpValidator v( rx, 0 );
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<a href="qstring.html">QString</a> s;
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int pos = 0;
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s = "0"; v.<a href="#validate">validate</a>( s, pos ); // returns Invalid
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s = "12345"; v.<a href="#validate">validate</a>( s, pos ); // returns Invalid
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s = "1"; v.<a href="#validate">validate</a>( s, pos ); // returns Acceptable
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rx.<a href="qregexp.html#setPattern">setPattern</a>( "\\S+" ); // one or more non-whitespace characters
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v.<a href="#setRegExp">setRegExp</a>( rx );
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s = "myfile.txt"; v.<a href="#validate">validate</a>( s, pos ); // Returns Acceptable
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s = "my file.txt"; v.<a href="#validate">validate</a>( s, pos ); // Returns Invalid
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// A, B or C followed by exactly five digits followed by W, X, Y or Z
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rx.<a href="qregexp.html#setPattern">setPattern</a>( "[A-C]\\d{5}[W-Z]" );
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v.<a href="#setRegExp">setRegExp</a>( rx );
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s = "a12345Z"; v.<a href="#validate">validate</a>( s, pos ); // Returns Invalid
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s = "A12345Z"; v.<a href="#validate">validate</a>( s, pos ); // Returns Acceptable
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s = "B12"; v.<a href="#validate">validate</a>( s, pos ); // Returns Intermediate
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// match most 'readme' files
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rx.<a href="qregexp.html#setPattern">setPattern</a>( "read\\S?me(\.(txt|asc|1st))?" );
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rx.<a href="qregexp.html#setCaseSensitive">setCaseSensitive</a>( FALSE );
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v.<a href="#setRegExp">setRegExp</a>( rx );
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s = "readme"; v.<a href="#validate">validate</a>( s, pos ); // Returns Acceptable
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s = "README.1ST"; v.<a href="#validate">validate</a>( s, pos ); // Returns Acceptable
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s = "read me.txt"; v.<a href="#validate">validate</a>( s, pos ); // Returns Invalid
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s = "readm"; v.<a href="#validate">validate</a>( s, pos ); // Returns Intermediate
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</pre>
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<p> <p>See also <a href="qregexp.html">QRegExp</a>, <a href="qintvalidator.html">QIntValidator</a>, <a href="qdoublevalidator.html">QDoubleValidator</a>, and <a href="misc.html">Miscellaneous Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QRegExpValidator"></a>QRegExpValidator::QRegExpValidator ( <a href="qobject.html">QObject</a> * parent, const char * name = 0 )
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</h3>
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Constructs a validator that accepts any string (including an empty
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one) as valid. The object's parent is <em>parent</em> and its name is <em>name</em>.
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<h3 class=fn><a name="QRegExpValidator-2"></a>QRegExpValidator::QRegExpValidator ( const <a href="qregexp.html">QRegExp</a> & rx, <a href="qobject.html">QObject</a> * parent, const char * name = 0 )
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</h3>
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Constructs a validator which accepts all strings that match the
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<a href="qregexp.html#regular-expression">regular expression</a> <em>rx</em>. The object's parent is <em>parent</em> and its
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name is <em>name</em>.
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<p> The match is made against the entire string, e.g. if the regexp is
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<b>[A-Fa-f0-9]+</b> it will be treated as <b>^[A-Fa-f0-9]+$</b>.
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<h3 class=fn><a name="~QRegExpValidator"></a>QRegExpValidator::~QRegExpValidator ()
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</h3>
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Destroys the validator, freeing any resources allocated.
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<h3 class=fn>const <a href="qregexp.html">QRegExp</a> & <a name="regExp"></a>QRegExpValidator::regExp () const
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</h3>
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<p> Returns the <a href="qregexp.html#regular-expression">regular expression</a> used for validation.
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<p> <p>See also <a href="#setRegExp">setRegExp</a>().
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<h3 class=fn>void <a name="setRegExp"></a>QRegExpValidator::setRegExp ( const <a href="qregexp.html">QRegExp</a> & rx )
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</h3>
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Sets the <a href="qregexp.html#regular-expression">regular expression</a> used for validation to <em>rx</em>.
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<p> <p>See also <a href="#regExp">regExp</a>().
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<h3 class=fn><a href="qvalidator.html#State-enum">QValidator::State</a> <a name="validate"></a>QRegExpValidator::validate ( <a href="qstring.html">QString</a> & input, int & pos ) const<tt> [virtual]</tt>
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</h3>
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Returns <a href="qvalidator.html#State-enum">Acceptable</a> if <em>input</em> is matched by the <a href="qregexp.html#regular-expression">regular expression</a> for this validator, <a href="qvalidator.html#State-enum">Intermediate</a> if it has matched
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partially (i.e. could be a valid match if additional valid
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characters are added), and <a href="qvalidator.html#State-enum">Invalid</a> if <em>input</em> is not matched.
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<p> The <em>pos</em> parameter is set to the length of the <em>input</em> parameter.
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<p> For example, if the regular expression is <b>\w\d\d</b> (that
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is, word-character, digit, digit) then "A57" is <a href="qvalidator.html#State-enum">Acceptable</a>,
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"E5" is <a href="qvalidator.html#State-enum">Intermediate</a> and "+9" is <a href="qvalidator.html#State-enum">Invalid</a>.
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<p> <p>See also <a href="qregexp.html#match">QRegExp::match</a>() and <a href="qregexp.html#search">QRegExp::search</a>().
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<p>Reimplemented from <a href="qvalidator.html#validate">QValidator</a>.
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<td align=right><div align=right>Qt 3.3.8</div>
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