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<H2><A NAME="SECTION006230000000000000000">
4.2.3 Module Contents</A>
</H2>
<P>
The module defines the following functions and constants, and an exception:
<P>
<dl><dt><b><a name='l2h-590'><tt class='function'>compile</tt></a></b> (<var>pattern</var><big>[</big><var>, flags</var><big>]</big>)
<dd>
Compile a regular expression pattern into a regular expression
object, which can be used for matching using its <tt class="function">match()</tt> and
<tt class="function">search()</tt> methods, described below.
<P>
The expression's behaviour can be modified by specifying a
<var>flags</var> value. Values can be any of the following variables,
combined using bitwise OR (the <code>|</code> operator).
<P>
The sequence
<P>
<dl><dd><pre class="verbatim">
prog = re.compile(pat)
result = prog.match(str)
</pre></dl>
<P>
is equivalent to
<P>
<dl><dd><pre class="verbatim">
result = re.match(pat, str)
</pre></dl>
<P>
but the version using <tt class="function">compile()</tt> is more efficient when the
expression will be used several times in a single program.
</dl>
<P>
<dl><dt><b><a name='l2h-591'><tt>I</tt></a></b>
<dd>
<dt><b><a name='l2h-605'><tt>IGNORECASE</tt></a></b><dd>
Perform case-insensitive matching; expressions like <tt class="regexp">[A-Z]</tt> will match
lowercase letters, too. This is not affected by the current locale.
</dl>
<P>
<dl><dt><b><a name='l2h-592'><tt>L</tt></a></b>
<dd>
<dt><b><a name='l2h-606'><tt>LOCALE</tt></a></b><dd>
Make <tt class="regexp">\w</tt>, <tt class="regexp">\W</tt>, <tt class="regexp">\b</tt>, and
<tt class="regexp">\B</tt> dependent on the current locale.
</dl>
<P>
<dl><dt><b><a name='l2h-593'><tt>M</tt></a></b>
<dd>
<dt><b><a name='l2h-607'><tt>MULTILINE</tt></a></b><dd>
When specified, the pattern character "<tt class="character">^</tt>" matches at the
beginning of the string and at the beginning of each line
(immediately following each newline); and the pattern character
"<tt class="character">$</tt>" matches at the end of the string and at the end of each line
(immediately preceding each newline).
By default, "<tt class="character">^</tt>" matches only at the beginning of the string, and
"<tt class="character">$</tt>" only at the end of the string and immediately before the
newline (if any) at the end of the string.
</dl>
<P>
<dl><dt><b><a name='l2h-594'><tt>S</tt></a></b>
<dd>
<dt><b><a name='l2h-608'><tt>DOTALL</tt></a></b><dd>
Make the "<tt class="character">.</tt>" special character match any character at all,
including a newline; without this flag, "<tt class="character">.</tt>" will match
anything <i>except</i> a newline.
</dl>
<P>
<dl><dt><b><a name='l2h-595'><tt>U</tt></a></b>
<dd>
<dt><b><a name='l2h-609'><tt>UNICODE</tt></a></b><dd>
Make <tt class="regexp">\w</tt>, <tt class="regexp">\W</tt>, <tt class="regexp">\b</tt>, and
<tt class="regexp">\B</tt> dependent on the Unicode character properties database.
New in version 2.0.
</dl>
<P>
<dl><dt><b><a name='l2h-596'><tt>X</tt></a></b>
<dd>
<dt><b><a name='l2h-610'><tt>VERBOSE</tt></a></b><dd>
This flag allows you to write regular expressions that look nicer.
Whitespace within the pattern is ignored,
except when in a character class or preceded by an unescaped
backslash, and, when a line contains a "<tt class="character">#</tt>" neither in a character
class or preceded by an unescaped backslash, all characters from the
leftmost such "<tt class="character">#</tt>" through the end of the line are ignored.
</dl>
<P>
<dl><dt><b><a name='l2h-597'><tt class='function'>search</tt></a></b> (<var>pattern, string</var><big>[</big><var>, flags</var><big>]</big>)
<dd>
Scan through <var>string</var> looking for a location where the regular
expression <var>pattern</var> produces a match, and return a
corresponding <tt class="class">MatchObject</tt> instance.
Return <code>None</code> if no
position in the string matches the pattern; note that this is
different from finding a zero-length match at some point in the string.
</dl>
<P>
<dl><dt><b><a name='l2h-598'><tt class='function'>match</tt></a></b> (<var>pattern, string</var><big>[</big><var>, flags</var><big>]</big>)
<dd>
If zero or more characters at the beginning of <var>string</var> match
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