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    <p>There's an excellent article on <a href="http://effbot.org/zone/xml-scanner.htm" rel="noreferrer">Using Regular Expressions for Lexical Analysis</a> at <a href="http://effbot.org/" rel="noreferrer">effbot.org</a>.</p> <p>Adapting the tokenizer to your problem:</p> <pre><code>import re token_pattern = r""" (?P&lt;identifier&gt;[a-zA-Z_][a-zA-Z0-9_]*) |(?P&lt;integer&gt;[0-9]+) |(?P&lt;dot&gt;\.) |(?P&lt;open_variable&gt;[$][{]) |(?P&lt;open_curly&gt;[{]) |(?P&lt;close_curly&gt;[}]) |(?P&lt;newline&gt;\n) |(?P&lt;whitespace&gt;\s+) |(?P&lt;equals&gt;[=]) |(?P&lt;slash&gt;[/]) """ token_re = re.compile(token_pattern, re.VERBOSE) class TokenizerException(Exception): pass def tokenize(text): pos = 0 while True: m = token_re.match(text, pos) if not m: break pos = m.end() tokname = m.lastgroup tokvalue = m.group(tokname) yield tokname, tokvalue if pos != len(text): raise TokenizerException('tokenizer stopped at pos %r of %r' % ( pos, len(text))) </code></pre> <p>To test it, we do:</p> <pre><code>stuff = r'property.${general.name}.ip = ${general.ip}' stuff2 = r''' general { name = myname ip = 127.0.0.1 } ''' print ' stuff '.center(60, '=') for tok in tokenize(stuff): print tok print ' stuff2 '.center(60, '=') for tok in tokenize(stuff2): print tok </code></pre> <p>for:</p> <pre><code>========================== stuff =========================== ('identifier', 'property') ('dot', '.') ('open_variable', '${') ('identifier', 'general') ('dot', '.') ('identifier', 'name') ('close_curly', '}') ('dot', '.') ('identifier', 'ip') ('whitespace', ' ') ('equals', '=') ('whitespace', ' ') ('open_variable', '${') ('identifier', 'general') ('dot', '.') ('identifier', 'ip') ('close_curly', '}') ========================== stuff2 ========================== ('newline', '\n') ('identifier', 'general') ('whitespace', ' ') ('open_curly', '{') ('newline', '\n') ('whitespace', ' ') ('identifier', 'name') ('whitespace', ' ') ('equals', '=') ('whitespace', ' ') ('identifier', 'myname') ('newline', '\n') ('whitespace', ' ') ('identifier', 'ip') ('whitespace', ' ') ('equals', '=') ('whitespace', ' ') ('integer', '127') ('dot', '.') ('integer', '0') ('dot', '.') ('integer', '0') ('dot', '.') ('integer', '1') ('newline', '\n') ('close_curly', '}') ('newline', '\n') </code></pre>
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    1. COFyi, [that kind of tokenizer](http://docs.python.org/3.2/library/re.html#writing-a-tokenizer) made it into the stdlib documention of the `re` module
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