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Initial commit of OpenSPARC T2 design and verification files.
[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / html / python / lib / re-objects.html
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55<H2><A NAME="SECTION006240000000000000000"></A><A NAME="re-objects"></A>
56<BR>
574.2.4 Regular Expression Objects
58</H2>
59
60<P>
61Compiled regular expression objects support the following methods and
62attributes:
63
64<P>
65<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
66 <td><nobr><b><tt id='l2h-891' xml:id='l2h-891' class="method">match</tt></b>(</nobr></td>
67 <td><var>string</var><big>[</big><var>, pos</var><big>[</big><var>,
68 endpos</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
69<dd>
70 If zero or more characters at the beginning of <var>string</var> match
71 this regular expression, return a corresponding
72 <tt class="class">MatchObject</tt> instance. Return <code>None</code> if the string does not
73 match the pattern; note that this is different from a zero-length
74 match.
75
76<P>
77<span class="note"><b class="label">Note:</b>
78If you want to locate a match anywhere in
79 <var>string</var>, use <tt class="method">search()</tt> instead.</span>
80
81<P>
82The optional second parameter <var>pos</var> gives an index in the string
83 where the search is to start; it defaults to <code>0</code>. This is not
84 completely equivalent to slicing the string; the
85 <code>'^'</code> pattern
86 character matches at the real beginning of the string and at positions
87 just after a newline, but not necessarily at the index where the search
88 is to start.
89
90<P>
91The optional parameter <var>endpos</var> limits how far the string will
92 be searched; it will be as if the string is <var>endpos</var> characters
93 long, so only the characters from <var>pos</var> to <code><var>endpos</var> -
94 1</code> will be searched for a match. If <var>endpos</var> is less than
95 <var>pos</var>, no match will be found, otherwise, if <var>rx</var> is a
96 compiled regular expression object,
97 <code><var>rx</var>.match(<var>string</var>, 0, 50)</code> is equivalent to
98 <code><var>rx</var>.match(<var>string</var>[:50], 0)</code>.
99</dl>
100
101<P>
102<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
103 <td><nobr><b><tt id='l2h-892' xml:id='l2h-892' class="method">search</tt></b>(</nobr></td>
104 <td><var>string</var><big>[</big><var>, pos</var><big>[</big><var>,
105 endpos</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
106<dd>
107 Scan through <var>string</var> looking for a location where this regular
108 expression produces a match, and return a
109 corresponding <tt class="class">MatchObject</tt> instance. Return <code>None</code> if no
110 position in the string matches the pattern; note that this is
111 different from finding a zero-length match at some point in the string.
112
113<P>
114The optional <var>pos</var> and <var>endpos</var> parameters have the same
115 meaning as for the <tt class="method">match()</tt> method.
116</dl>
117
118<P>
119<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
120 <td><nobr><b><tt id='l2h-893' xml:id='l2h-893' class="method">split</tt></b>(</nobr></td>
121 <td><var>string</var><big>[</big><var>,
122 maxsplit<code> = 0</code></var><big>]</big><var></var>)</td></tr></table></dt>
123<dd>
124Identical to the <tt class="function">split()</tt> function, using the compiled pattern.
125</dl>
126
127<P>
128<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
129 <td><nobr><b><tt id='l2h-894' xml:id='l2h-894' class="method">findall</tt></b>(</nobr></td>
130 <td><var>string</var><big>[</big><var>, pos</var><big>[</big><var>,
131 endpos</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
132<dd>
133Identical to the <tt class="function">findall()</tt> function, using the compiled pattern.
134</dl>
135
136<P>
137<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
138 <td><nobr><b><tt id='l2h-895' xml:id='l2h-895' class="method">finditer</tt></b>(</nobr></td>
139 <td><var>string</var><big>[</big><var>, pos</var><big>[</big><var>,
140 endpos</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
141<dd>
142Identical to the <tt class="function">finditer()</tt> function, using the compiled pattern.
143</dl>
144
145<P>
146<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
147 <td><nobr><b><tt id='l2h-896' xml:id='l2h-896' class="method">sub</tt></b>(</nobr></td>
148 <td><var>repl, string</var><big>[</big><var>, count<code> = 0</code></var><big>]</big><var></var>)</td></tr></table></dt>
149<dd>
150Identical to the <tt class="function">sub()</tt> function, using the compiled pattern.
151</dl>
152
153<P>
154<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
155 <td><nobr><b><tt id='l2h-897' xml:id='l2h-897' class="method">subn</tt></b>(</nobr></td>
156 <td><var>repl, string</var><big>[</big><var>,
157 count<code> = 0</code></var><big>]</big><var></var>)</td></tr></table></dt>
158<dd>
159Identical to the <tt class="function">subn()</tt> function, using the compiled pattern.
160</dl>
161
162<P>
163<dl><dt><b><tt id='l2h-898' xml:id='l2h-898' class="member">flags</tt></b></dt>
164<dd>
165The flags argument used when the RE object was compiled, or
166<code>0</code> if no flags were provided.
167</dl>
168
169<P>
170<dl><dt><b><tt id='l2h-899' xml:id='l2h-899' class="member">groupindex</tt></b></dt>
171<dd>
172A dictionary mapping any symbolic group names defined by
173<tt class="regexp">(?P&lt;<var>id</var>&gt;)</tt> to group numbers. The dictionary is empty if no
174symbolic groups were used in the pattern.
175</dl>
176
177<P>
178<dl><dt><b><tt id='l2h-900' xml:id='l2h-900' class="member">pattern</tt></b></dt>
179<dd>
180The pattern string from which the RE object was compiled.
181</dl>
182
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219<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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Full OpenSPARC design & verification tarball including full HDL.