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PONeverending Regex : Regex couldn't terminate while matching a 69 character String (killed after a week)
 

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    <p>Never thought it would be possible to write a Regex which never returns.</p> <p>The Regex</p> <pre><code>/^((?:\d|\w{1,2}[-\d\s])(?:[-\s\d]|\w{1,2}[-\d\s])*\d)$/ </code></pre> <p>was built to match numbers which start with a digit or two letters followed by a dash a blank or digits and end with a number. In between the starting pattern could be repeated or a whitespace or dash could occur.</p> <p>Examples: 1234 , de-12943, EN - 12de -50</p> <p>Following example code will not terminate:</p> <p>ruby</p> <pre><code>#!/usr/bin/ruby string = "101000000750000000000000000000000001000038127OXMOO0OOOOO00000000000N9" re = /^((?:\d|\w{1,2}[-\d\s])(?:[-\s\d]|\w{1,2}[-\d\s])*\d)$/ p re.match("101000000750000000000000000000000001000038127OXMOO0OOOOO00000000000N9") </code></pre> <p>scala</p> <pre><code>"""^((?:\d|\w{1,2}[-\d\s])(?:[-\s\d]|\w{1,2}[-\d\s])*\d)$""".r findFirstIn "101000000750000000000000000000000001000038127OXMOO0OOOOO00000000000N9" </code></pre> <p>Removing the Anchors (^, $) lets the regex terminate quickly.</p> <p>Tried with Ruby and Scala.</p> <p>What's happening there? Should't the anchors lead to faster termination?</p>
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