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2010-06-04T16:39:24.337
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polygenelubricants already explained why your regex failed. The reason it hangs is that you're running into <a href="http://www.regular-expressions.info/catastrophic.html" rel="nofollow noreferrer">catastrophic backtracking</a>. Your regex has many parts that can match the same text in a lot of different ways. If the overall match fails, the regex engine will try all possible permutations until it either exhausts them all or aborts with a Stack Overflow. E. g. in <code>To:\W+(?<custAddr>.*?)\W+</code> the <code>.*?</code> will gladly match the same characters as <code>\W</code>, and since you're using <code>Singleline</code>, the <code>.*?</code> will also cross over into the <code>No:...</code> part of the input text and further and further. In your example, I tested in RegexBuddy what happens if you add the "N" after "Cust" - the regex engine aborts after 1,000,000 steps. To avoid this, you need to make the regex more specific, or (this might be the better option in this case) keep the regex engine from backtracking by enclosing parts that have already matched in "<a href="http://www.regular-expressions.info/atomic.html" rel="nofollow noreferrer">atomic groups</a>": <pre><code>(?>\W+INVOICE\W+) (?>(?<shopAddr>.*?)\W+To:) (?>\W+(?<custAddr>.*?)\W+No:) (?>\W+(?<invNo>\d+).*?Date:) (?>\W+(?<invDate>[0-9/\ :]+)\W+Ref:) (?>\W+(?<ref>[\w\ ]*?)\W+Cust) </code></pre> This allows the regex to fail much faster if the input and the regex happen not to fit together.
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1. POAdding a single character to my .NET RegEx causes it to hang
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1. USTim Pietzcker
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1. CO+1. This post really makes me want to grab RegexBuddy so I can do benchmarking on my own.
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