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copied!<p>The explanation of the regular expression that you posted (created using <a href="http://www.regexbuddy.com" rel="nofollow">RegexBuddy</a>):</p> <pre class="lang-none prettyprint-override"><code>^.syn ((([0-9]{1,3}\.){3}[0-9]{1,3})|([a-zA-Z0-9_-]+\.[a-zA-Z0-9_-]+\.[a-zA-Z0-9_.-]+)) [0-9]{1,5} [0-9]{1,15} [0-9]{1,15} Assert position at the beginning of the string «^» Match any single character that is not a line break character «.» Match the characters “syn ” literally «syn » Match the regular expression below and capture its match into backreference number 1 «((([0-9]{1,3}\.){3}[0-9]{1,3})|([a-zA-Z0-9_-]+\.[a-zA-Z0-9_-]+\.[a-zA-Z0-9_.-]+))» Match either the regular expression below (attempting the next alternative only if this one fails) «(([0-9]{1,3}\.){3}[0-9]{1,3})» Match the regular expression below and capture its match into backreference number 2 «(([0-9]{1,3}\.){3}[0-9]{1,3})» Match the regular expression below and capture its match into backreference number 3 «([0-9]{1,3}\.){3}» Exactly 3 times «{3}» Note: You repeated the capturing group itself. The group will capture only the last iteration. Put a capturing group around the repeated group to capture all iterations. «{3}» Match a single character in the range between “0” and “9” «[0-9]{1,3}» Between one and 3 times, as many times as possible, giving back as needed (greedy) «{1,3}» Match the character “.” literally «\.» Match a single character in the range between “0” and “9” «[0-9]{1,3}» Between one and 3 times, as many times as possible, giving back as needed (greedy) «{1,3}» Or match regular expression number 2 below (the entire group fails if this one fails to match) «([a-zA-Z0-9_-]+\.[a-zA-Z0-9_-]+\.[a-zA-Z0-9_.-]+)» Match the regular expression below and capture its match into backreference number 4 «([a-zA-Z0-9_-]+\.[a-zA-Z0-9_-]+\.[a-zA-Z0-9_.-]+)» Match a single character present in the list below «[a-zA-Z0-9_-]+» Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» A character in the range between “a” and “z” «a-z» A character in the range between “A” and “Z” «A-Z» A character in the range between “0” and “9” «0-9» The character “_” «_» The character “-” «-» Match the character “.” literally «\.» Match a single character present in the list below «[a-zA-Z0-9_-]+» Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» A character in the range between “a” and “z” «a-z» A character in the range between “A” and “Z” «A-Z» A character in the range between “0” and “9” «0-9» The character “_” «_» The character “-” «-» Match the character “.” literally «\.» Match a single character present in the list below «[a-zA-Z0-9_.-]+» Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» A character in the range between “a” and “z” «a-z» A character in the range between “A” and “Z” «A-Z» A character in the range between “0” and “9” «0-9» The character “_” «_» The character “.” «.» The character “-” «-» Match the character “ ” literally « » Match a single character in the range between “0” and “9” «[0-9]{1,5}» Between one and 5 times, as many times as possible, giving back as needed (greedy) «{1,5}» Match the character “ ” literally « » Match a single character in the range between “0” and “9” «[0-9]{1,15}» Between one and 15 times, as many times as possible, giving back as needed (greedy) «{1,15}» Match the character “ ” literally « » Match a single character in the range between “0” and “9” «[0-9]{1,15}» Between one and 15 times, as many times as possible, giving back as needed (greedy) «{1,15}» </code></pre>

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