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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Netstring_str</title>
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<center><h1>Module <a href="type_Netstring_str.html">Netstring_str</a></h1></center>
<br>
<pre><span class="keyword">module</span> Netstring_str: <code class="code">sig</code> <a href="Netstring_str.html">..</a> <code class="code">end</code></pre>Wrapper for regexps with <code class="code">Str</code> syntax
<p>
This module was written at a time when we had only the <code class="code">Str</code> module
for regular expressions. However, <code class="code">Str</code> has an interface that does
not work for multi-threaded programs, because the state of the module
is visible to the outside. The module <code class="code">Netstring_str</code> is similar to <code class="code">Str</code>,
but has a thread-compatible interface.
<p>
Now we have the much better PCRE library for regular expressions.
This implementation of <code class="code">Netstring_str</code> bases on the PCRE engine but retains
the old interface as much as possible. This includes that the <code class="code">regexp</code>
function parses old-style regular expressions and internally translates
them to PCRE-style expressions.
<p>
See also <a href="Netstring_pcre.html"><code class="code">Netstring_pcre</code></a>. The difference is that <code class="code">Netstring_pcre</code> expects
already PCRE-style regular expressions and does not translate them.<br>
<hr width="100%">
<br>
<b>Supported regexp syntax</b>
<p>
<pre><code class="code"> . matches every character but newline
e* matches e several times
e+ matches e several times but at least once
e? matches e optionally
e{m,n} matches e at least m times and at most n times
e1\|e2 matches e1 or e2
[set] matches the characters from set
[^set] matches the characters except from set
\(...\) group paranthesis
\n back reference
\w matches word (= alphanumeric characters (and underscore))
\W matches characters except \w
\b matches at word boundary
\B matches everywhere but not at word boundary
\< matches at beginning of word
\> matches at end of word
^ matches at beginning of line
$ matches at end of line
\` matches at beginning of buffer
\' matches at end of buffer
</code></pre>
<p>
This is exactly what <code class="code">Str</code> supports with one exception. Character classes
are not implemented.<br>
<pre><span class="keyword">type</span> <a name="TYPEregexp"></a><code class="type"></code>regexp = <code class="type">Pcre.regexp</code> </pre>
<div class="info">
The type of regular expressions; now based on <code class="code">Pcre</code><br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEsplit_result"></a><code class="type"></code>split_result = <code class="type">Str.split_result</code> = </pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span class="constructor">Text</span> <span class="keyword">of</span> <code class="type">string</code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span class="constructor">Delim</span> <span class="keyword">of</span> <code class="type">string</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >Here we keep compatibility with <code class="code">Str</code></td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>
<pre><span class="keyword">type</span> <a name="TYPEresult"></a><code class="type"></code>result </pre>
<div class="info">
The type of matching results<br>
</div>
<pre><span class="keyword">val</span> <a name="VALregexp"></a>regexp : <code class="type">string -> <a href="Netstring_str.html#TYPEregexp">regexp</a></code></pre><div class="info">
Parses a regexp<br>
</div>
<pre><span class="keyword">val</span> <a name="VALregexp_case_fold"></a>regexp_case_fold : <code class="type">string -> <a href="Netstring_str.html#TYPEregexp">regexp</a></code></pre><div class="info">
Parses a case-insensitive regexp<br>
</div>
<pre><span class="keyword">val</span> <a name="VALquote"></a>quote : <code class="type">string -> string</code></pre><div class="info">
Quotes a string such that it can be included in a regexp<br>
</div>
<pre><span class="keyword">val</span> <a name="VALregexp_string"></a>regexp_string : <code class="type">string -> <a href="Netstring_str.html#TYPEregexp">regexp</a></code></pre><div class="info">
Returns a regexp that matches exactly the string<br>
</div>
<pre><span class="keyword">val</span> <a name="VALregexp_string_case_fold"></a>regexp_string_case_fold : <code class="type">string -> <a href="Netstring_str.html#TYPEregexp">regexp</a></code></pre><div class="info">
Returns a case-insensitive regexp that matches exactly the string<br>
</div>
<br>
Note: the <code class="code">groups</code> argument is ignored in the following functions.
Once upon a time this argument determined how many groups were
copied to the <code class="code">result</code> value.
Now all groups are accessible in the <code class="code">result</code> value, no matter
what <code class="code">groups</code> says.<br>
<pre><span class="keyword">val</span> <a name="VALstring_match"></a>string_match : <code class="type">?groups:int -><br> <a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> <a href="Netstring_str.html#TYPEresult">result</a> option</code></pre><div class="info">
Matches the string at the position with the regexp. Returns
<code class="code">None</code> if no match is found. Returns <code class="code">Some r</code> on success,
and <code class="code">r</code> describes the match.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALsearch_forward"></a>search_forward : <code class="type">?groups:int -><br> <a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> int * <a href="Netstring_str.html#TYPEresult">result</a></code></pre><div class="info">
Searches a match of the string with the regexp, starting at
the position and in forward direction.
Raises <code class="code">Not_found</code> if no match could be found.
Returns <code class="code">(p,r)</code> when a match at position <code class="code">p</code> is found,
described by <code class="code">r</code>.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALsearch_backward"></a>search_backward : <code class="type">?groups:int -><br> <a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> int * <a href="Netstring_str.html#TYPEresult">result</a></code></pre><div class="info">
Searches a match of the string with the regexp, starting at
the position and in backward direction.
Raises <code class="code">Not_found</code> if no match could be found.
Returns <code class="code">(p,r)</code> when a match at position <code class="code">p</code> is found,
described by <code class="code">r</code>.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALmatched_string"></a>matched_string : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> string -> string</code></pre><div class="info">
Extracts the matched part from the string. The string argument
must be the same string passed to <code class="code">string_match</code> or the search
functions, and the result argument must be the corresponding
result.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALmatch_beginning"></a>match_beginning : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> int</code></pre><div class="info">
Returns the position where the matched part begins<br>
</div>
<pre><span class="keyword">val</span> <a name="VALmatch_end"></a>match_end : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> int</code></pre><div class="info">
Returns the position where the matched part ends<br>
</div>
<pre><span class="keyword">val</span> <a name="VALmatched_group"></a>matched_group : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> int -> string -> string</code></pre><div class="info">
Extracts the substring the nth group matches from the whole
string. The string argument
must be the same string passed to <code class="code">string_match</code> or the search
functions, and the result argument must be the corresponding
result.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALgroup_beginning"></a>group_beginning : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> int -> int</code></pre><div class="info">
Returns the position where the substring matching the nth
group begins<br>
</div>
<pre><span class="keyword">val</span> <a name="VALgroup_end"></a>group_end : <code class="type"><a href="Netstring_str.html#TYPEresult">result</a> -> int -> int</code></pre><div class="info">
Returns the position where the substring matching the nth
group ends<br>
</div>
<pre><span class="keyword">val</span> <a name="VALglobal_replace"></a>global_replace : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> string -> string</code></pre><div class="info">
<code class="code">global_replace re templ s</code>: Replaces all matchings of <code class="code">re</code> in
<code class="code">s</code> by <code class="code">templ</code>.
<p>
In <code class="code">templ</code> one can refer to matched groups by the backslash notation:
<code class="code">\1</code> refers to the first group, <code class="code">\2</code> to the second etc.
<code class="code">\0</code> is the whole match. <code class="code">\\ </code> is the backslash character.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALreplace_first"></a>replace_first : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> string -> string</code></pre><div class="info">
<code class="code">replace_first re templ s</code>: Replaces the first match of <code class="code">re</code> in
<code class="code">s</code> by <code class="code">templ</code>.
<p>
In <code class="code">templ</code> one can refer to matched groups by the backslash notation:
<code class="code">\1</code> refers to the first group, <code class="code">\2</code> to the second etc.
<code class="code">\0</code> is the whole match. <code class="code">\\ </code> is the backslash character.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALglobal_substitute"></a>global_substitute : <code class="type">?groups:int -><br> <a href="Netstring_str.html#TYPEregexp">regexp</a> -><br> (<a href="Netstring_str.html#TYPEresult">result</a> -> string -> string) -> string -> string</code></pre><div class="info">
<code class="code">global_substitute re subst s</code>: Applies the substitution function
<code class="code">subst</code> to all matchings of <code class="code">re</code> in <code class="code">s</code>, and returns the
transformed string. <code class="code">subst</code> is called with the current <code class="code">result</code>
of the match and the whole string <code class="code">s</code>.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALsubstitute_first"></a>substitute_first : <code class="type">?groups:int -><br> <a href="Netstring_str.html#TYPEregexp">regexp</a> -><br> (<a href="Netstring_str.html#TYPEresult">result</a> -> string -> string) -> string -> string</code></pre><div class="info">
<code class="code">substitute_first re subst s</code>: Applies the substitution function
<code class="code">subst</code> to the first matching of <code class="code">re</code> in <code class="code">s</code>, and returns the
transformed string. <code class="code">subst</code> is called with the current <code class="code">result</code>
of the match and the whole string <code class="code">s</code>.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALsplit"></a>split : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> string list</code></pre><div class="info">
Splits the string according to the regexp in substrings.
Occurrences of the delimiter at the beginning and the end
are ignored.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALbounded_split"></a>bounded_split : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> string list</code></pre><div class="info">
Splits into at most <code class="code">n</code> substrings, based on <code class="code">split</code><br>
</div>
<pre><span class="keyword">val</span> <a name="VALsplit_delim"></a>split_delim : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> string list</code></pre><div class="info">
Same as <code class="code">split</code>, but occurrences of the delimiter at the beginning
and the end are returned as empty strings<br>
</div>
<pre><span class="keyword">val</span> <a name="VALbounded_split_delim"></a>bounded_split_delim : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> string list</code></pre><div class="info">
Splits into at most <code class="code">n</code> substrings, based on <code class="code">split_delim</code><br>
</div>
<pre><span class="keyword">val</span> <a name="VALfull_split"></a>full_split : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> <a href="Netstring_str.html#TYPEsplit_result">split_result</a> list</code></pre><div class="info">
Like <code class="code">split_delim</code>, but returns the delimiters in the result<br>
</div>
<pre><span class="keyword">val</span> <a name="VALbounded_full_split"></a>bounded_full_split : <code class="type"><a href="Netstring_str.html#TYPEregexp">regexp</a> -> string -> int -> <a href="Netstring_str.html#TYPEsplit_result">split_result</a> list</code></pre><div class="info">
Splits into at most <code class="code">n</code> substrings, based on <code class="code">full_split</code><br>
</div>
<pre><span class="keyword">val</span> <a name="VALstring_before"></a>string_before : <code class="type">string -> int -> string</code></pre><div class="info">
The first <code class="code">n</code> characters of a string<br>
</div>
<pre><span class="keyword">val</span> <a name="VALstring_after"></a>string_after : <code class="type">string -> int -> string</code></pre><div class="info">
The last <code class="code">n</code> characters of a string<br>
</div>
<pre><span class="keyword">val</span> <a name="VALfirst_chars"></a>first_chars : <code class="type">string -> int -> string</code></pre><div class="info">
Same as <code class="code">string_before</code><br>
</div>
<pre><span class="keyword">val</span> <a name="VALlast_chars"></a>last_chars : <code class="type">string -> int -> string</code></pre><div class="info">
Same as <code class="code">string_after</code><br>
</div>
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