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copied!<p>You might want to take a look at <a href="https://github.com/rhdunn/cainteoir-engine/blob/0c283e798c8141a65060c5e92f462646c2689644/tests/dictionary.py" rel="nofollow">https://github.com/rhdunn/cainteoir-engine/blob/0c283e798c8141a65060c5e92f462646c2689644/tests/dictionary.py</a>.</p> <p>I wrote this to support regular expressions in text-to-speech pronunciation dictionaries, but the regex expanding logic is self-contained. You can use it like:</p> <pre><code>import dictionary words, endings = dictionary.expand_expression('colou?r', {}) print words </code></pre> <p>Here, the second parameter is for references (i.e. named blocks) and the endings is for, e.g. <code>look{s,ed,ing}</code></p> <p>How it works ...</p> <p><code>lex_expression</code> splits the string into tokens delimited by the regex tokens <code>[]<>|(){}?</code>. Thus, <code>a(b|cd)efg</code> becomes <code>['a', '(', 'b', '|', 'cd', ')', 'efg']</code>. This makes it easier to parse the regex.</p> <p>The <code>parse_XYZ_expr</code> functions (along with the top-level <code>parse_expr</code>) parse the regex elements, constructing an object hierarchy that represents the regex. These objects are:</p> <ul> <li>Literal -- a literal sequence of one or more characters</li> <li>Choice -- any of the sub-expressions in the sequence (i.e. '|')</li> <li>Optional -- either the result of the expression, or not (i.e. <code>a?</code>)</li> <li>Sequence -- the sub-expressions in order</li> </ul> <p>Thus, <code>ab(cd|e)?</code> is represented as <code>Sequence(Literal('ab'), Optional(Choice(Literal('cd'), Literal('e'))))</code>.</p> <p>These classes support an <code>expand</code> method that has the form <code>expr.expand(words) => expanded</code>, e.g.:</p> <pre><code>expr = Optional('cd') print expr.expand(['ab', 'ef']) </code></pre> <p>results in:</p> <pre><code>ab abcd ef efcd </code></pre>

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