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  1. PO
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    <p>I can give you a pattern that would work with Ruby (sorry, I haven't used C# for a while). This pattern will capture the numbers, if used with the <code>scan</code> function. I'm sure there will be something you can do with captures and groups in C# that is similar:</p> <pre class="lang-rb prettyprint-override"><code>pattern = /^\s*( [\-\+]? [0-9]+ ) ( (\s+ [\-\+]? [0-9]+ ) )*$/x xs = ["9", "+9", "-9", "87", "+87", "-87", "9 87", "9 +87", "9 -87", "+9 87", "-9 87", "+9 +87", "-9 +87", "-9 87", "9 +9 -9", "9 +9 87", "9 +9 +87", "9 +9 -87", "9 +9 654", "9 +9 +654", "9 +9 -654", "9 -9 87", "9 -9 +87", "9 -9 -87", "9 -9 654", "9 -9 +654", "9 -9 -654", "9 87 +87", "9 87 -87", "9 87 654", "9 87 +654", "9 87 -654", "9 +87 -87", "9 +87 654", "9 +87 +654", "9 +87 -654", "9 -87 654", "9 -87 +654", "9 -87 -654", "9 654 +654", "9 654 -654", "9 +654 -654", "+9 -9 87", "+9 -9 +87", "+9 -9 -87", "+9 -9 654", "+9 -9 +654", "+9 -9 -654", "+9 87 +87", "+9 87 -87", "+9 87 654", "+9 87 +654", "+9 87 -654", "+9 +87 -87", "+9 +87 654", "+9 +87 +654", "+9 +87 -654", "+9 -87 654", "+9 -87 +654", "+9 -87 -654", "+9 654 +654", "+9 654 -654", "+9 +654 -654", "-9 87 +87", "-9 87 -87", "-9 87 654", "-9 87 +654", "-9 87 -654", "-9 +87 -87", "-9 +87 654", "-9 +87 +654", "-9 +87 -654", "-9 -87 654", "-9 -87 +654", "-9 -87 -654", "-9 654 +654", "-9 654 -654", "-9 +654 -654", " 87 +87 -87", " 87 +87 654", " 87 +87 +654", " 87 +87 -654", " 87 -87 654", " 87 -87 +654", " 87 -87 -654", " 87 654 +654", " 87 654 -654", " 87 +654 -654", " +87 -87 654", " +87 -87 +654", " +87 -87 -654", " +87 654 +654", " +87 654 -654", " +87 +654 -654", " -87 654 +654", " -87 654 -654", " -87 +654 -654", "654 +654 -654"] xs.each{|x| printf("%15s: %s\n", x, x.scan(pattern).inspect) } </code></pre> <p>Results in:</p> <pre><code> 9: ["9"] +9: ["+9"] -9: ["-9"] 87: ["87"] +87: ["+87"] -87: ["-87"] 9 87: ["9", "87"] 9 +87: ["9", "+87"] 9 -87: ["9", "-87"] +9 87: ["+9", "87"] -9 87: ["-9", "87"] +9 +87: ["+9", "+87"] -9 +87: ["-9", "+87"] -9 87: ["-9", "87"] 9 +9 -9: ["9", "+9", "-9"] 9 +9 87: ["9", "+9", "87"] 9 +9 +87: ["9", "+9", "+87"] 9 +9 -87: ["9", "+9", "-87"] 9 +9 654: ["9", "+9", "654"] 9 +9 +654: ["9", "+9", "+654"] 9 +9 -654: ["9", "+9", "-654"] 9 -9 87: ["9", "-9", "87"] 9 -9 +87: ["9", "-9", "+87"] 9 -9 -87: ["9", "-9", "-87"] 9 -9 654: ["9", "-9", "654"] 9 -9 +654: ["9", "-9", "+654"] 9 -9 -654: ["9", "-9", "-654"] 9 87 +87: ["9", "87", "+87"] 9 87 -87: ["9", "87", "-87"] 9 87 654: ["9", "87", "654"] 9 87 +654: ["9", "87", "+654"] 9 87 -654: ["9", "87", "-654"] 9 +87 -87: ["9", "+87", "-87"] 9 +87 654: ["9", "+87", "654"] 9 +87 +654: ["9", "+87", "+654"] 9 +87 -654: ["9", "+87", "-654"] 9 -87 654: ["9", "-87", "654"] 9 -87 +654: ["9", "-87", "+654"] 9 -87 -654: ["9", "-87", "-654"] 9 654 +654: ["9", "654", "+654"] 9 654 -654: ["9", "654", "-654"] 9 +654 -654: ["9", "+654", "-654"] +9 -9 87: ["+9", "-9", "87"] +9 -9 +87: ["+9", "-9", "+87"] +9 -9 -87: ["+9", "-9", "-87"] +9 -9 654: ["+9", "-9", "654"] +9 -9 +654: ["+9", "-9", "+654"] +9 -9 -654: ["+9", "-9", "-654"] +9 87 +87: ["+9", "87", "+87"] +9 87 -87: ["+9", "87", "-87"] +9 87 654: ["+9", "87", "654"] +9 87 +654: ["+9", "87", "+654"] +9 87 -654: ["+9", "87", "-654"] +9 +87 -87: ["+9", "+87", "-87"] +9 +87 654: ["+9", "+87", "654"] +9 +87 +654: ["+9", "+87", "+654"] +9 +87 -654: ["+9", "+87", "-654"] +9 -87 654: ["+9", "-87", "654"] +9 -87 +654: ["+9", "-87", "+654"] +9 -87 -654: ["+9", "-87", "-654"] +9 654 +654: ["+9", "654", "+654"] +9 654 -654: ["+9", "654", "-654"] +9 +654 -654: ["+9", "+654", "-654"] -9 87 +87: ["-9", "87", "+87"] -9 87 -87: ["-9", "87", "-87"] -9 87 654: ["-9", "87", "654"] -9 87 +654: ["-9", "87", "+654"] -9 87 -654: ["-9", "87", "-654"] -9 +87 -87: ["-9", "+87", "-87"] -9 +87 654: ["-9", "+87", "654"] -9 +87 +654: ["-9", "+87", "+654"] -9 +87 -654: ["-9", "+87", "-654"] -9 -87 654: ["-9", "-87", "654"] -9 -87 +654: ["-9", "-87", "+654"] -9 -87 -654: ["-9", "-87", "-654"] -9 654 +654: ["-9", "654", "+654"] -9 654 -654: ["-9", "654", "-654"] -9 +654 -654: ["-9", "+654", "-654"] 87 +87 -87: ["87", "+87", "-87"] 87 +87 654: ["87", "+87", "654"] 87 +87 +654: ["87", "+87", "+654"] 87 +87 -654: ["87", "+87", "-654"] 87 -87 654: ["87", "-87", "654"] 87 -87 +654: ["87", "-87", "+654"] 87 -87 -654: ["87", "-87", "-654"] 87 654 +654: ["87", "654", "+654"] 87 654 -654: ["87", "654", "-654"] 87 +654 -654: ["87", "+654", "-654"] +87 -87 654: ["+87", "-87", "654"] +87 -87 +654: ["+87", "-87", "+654"] +87 -87 -654: ["+87", "-87", "-654"] +87 654 +654: ["+87", "654", "+654"] +87 654 -654: ["+87", "654", "-654"] +87 +654 -654: ["+87", "+654", "-654"] -87 654 +654: ["-87", "654", "+654"] -87 654 -654: ["-87", "654", "-654"] -87 +654 -654: ["-87", "+654", "-654"] 654 +654 -654: ["654", "+654", "-654"] </code></pre>
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