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    <p>People don't seem to get the fact that they don't have to use REs (or SQL, but that's another issue :-) for every task, especially those with procedural code is cleaner.</p> <p>If you're limiting yourself to using REs, I think that's a lack of vision.</p> <p>I would simply process the string, token by token, where a token is one of:</p> <ul> <li>a non-delimiter.</li> <li>a column delimiter.</li> <li>a row delimiter.</li> </ul> <p>Start with an empty column list, then extract (using indexOf/substring stuff) up to the first next row/column delimiter, adding that text to the column list.</p> <p>If the delimiter is column, keep going.</p> <p>If the delimiter is row, check the number of columns and process the list as required.</p> <p>If there's no final row delimiter and the column list is non-empty, then the format was invalid.</p> <p>Sorry if you were really after an RE method but I don't believe it's required (or even desirable) here.</p> <p>Pseudo-code (only a first cut, may be slightly buggy) follows:</p> <pre><code>def processStr(s): if not s.endsWith ("|ROW-DELIM|"): error "Invalid format" columnList = [] while not s.equals (""): nextRowDelim = s.indexOf ("|ROW-DELIM|") nextColDelim = s.indexOf ("|COL-DELIM|") if nextColDelim == NotFound: nextColDelim = nextRowDelim + 1 nextDelim = minimumOf (nextRowDelim,nextColDelim) columnList.add (s.substring (0, nextDelim)) s = s.substring (nextDelim) if nextDelim == nextRowDelim: s = s.substring (length ("|ROW-DELIM|")) processColumns (columnList) columnList = [] else: s = s.substring (length ("|COL-DELIM|")) </code></pre> <p>You could easily add code to check the correct number of columns in this code, or in <code>processColumns()</code>, if that was your desire.</p>
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    1. USpaxdiablo
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    1. COTrue, I was just going to use String.split [in Java] and do what you suggested, but I thought I might at least be able to use Regex to perform a "matches". Just to verify the String is in the expected format.
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    2. CO+1 (especially since the OP didn't manage to up-vote you)
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    3. CO@codecraig, given your spec that you can have anything between delimiters (including empty strings) and the fact that you don't need "|COL-DELIM||ROW-DELIM|" at the end of each row, the only real check is that the string ends in a row delim (and maybe number of columns is right and/or consistent).
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