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POSplit tokens on string using Regex in c#
 

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    <p>I have some "tokenized" templates, for example (I call <em>tokens</em> the part between double braces): </p> <pre class="lang-cs prettyprint-override"><code>var template1 = "{{TOKEN1}} is a {{TOKEN2}} and it has some {{TOKEN3}}"; </code></pre> <p>I want to extract an array from this sentence, in order to have something like:</p> <pre class="lang-cs prettyprint-override"><code>Array("{{TOKEN1}}", " is a ", "{{TOKEN2}}", " and it has some ", "{{TOKEN3}}"); </code></pre> <p>I've tried to achieve that with the following Regex code:</p> <pre class="lang-cs prettyprint-override"><code>Regex r = new Regex(@"({{[^\}]*}})"); var n = r.Split(template1); </code></pre> <p>And the result is:</p> <pre class="lang-cs prettyprint-override"><code>Array("", "{{TOKEN1}}", " is a ", "{{TOKEN2}}", " and it has some ", "{{TOKEN3}}", ""); </code></pre> <p>The first issue was that I was not able to recover the tokens from the sentence. I solved this just by adding the parentheses on the Regex expression, even though I'm not sure why does it solves this.</p> <p>The issue I'm currently facing is the extra empty term in the beginning and/or in the end of the array <strong>when the first and/or last terms on the template are "tokens"</strong>. Why is it happening? Am I doing something wrong, or I should I always check these two positions for emptiness?</p> <p>On my code, I will need to know which term came from a token and which was a fixed position on the template. On this solution, I will have to check every array's position for a string starting with "{{" and ending with "}}", which I don't think is the best possibility. So, if someone comes up with a better solution to break these things apart, I'll be glad to know!</p> <p>Thank you!</p> <p><strong>Edit:</strong> as requested, I'll post a simple example to why do I need this distinction on tokens and text.</p> <pre class="lang-cs prettyprint-override"><code>public abstract class TextParts { } public class TextToken : TextParts { } public class TextConstant : TextParts { } var list = new List&lt;TextParts&gt;(); list.Add( new TextToken("{{TOKEN1}}") ); list.Add( new TextConstant(" is a ") ); list.Add( new TextToken("{{TOKEN2}}") ); /* and so on */ </code></pre> <p>This way, I'll have a list of the parts that composes my string and I'll be able to record that on my database to allow future manipulation and substitution. In fact, each of this TOKEN will be replaced by a Regex string.</p> <p>The objective is that users will be able to input messages like "{{SERVER}} is not listening on port {{PORT}}", and I'll be able to replace "{{SERVER}}" to <code>[a-zA-Z0-9 ]+</code> and "{{PORT}}" to <code>\d{1,5}</code>. Makes sense?</p> <p>I hope this makes the post more clear.</p>
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    1. COWhy do you need to break apart the lines? Is it not enough to just replace the tokens? (because just removing empty strings from beginning and end WOULD be the best solution if your final goal is to retrieve the first array you posted; but I suppose you want to accomplish something with that array, and we could probably give better answers if we knew what you want to achieve ;))
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    2. COI'm sorry for not answering your question before. In my models, I will need to create different objects for the tokens and for the text. I'm updating the last part of my post just to reflect this.
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