I’m not familiar with ASP.NET. But the regular expression should look like this: ^[a-zA-Z0-9]{6,}$ ^ and $ denote the begin and end of the string respectively; [a-zA-Z0-9] describes one single alphanumeric character and {6,} allows six or more repetitions.
On OSX sed (BSD) sed requires an extension after -i option. Since it is finding -e afterwards it is adding -e to each input filename. btw you don’t even need -e option here. You can pass an empty extension like this: sed -i ” ‘s/foo/bar/g’ $file Or use .bak for an extension to save original … Read more
that’s sounds more like a job for the filehandle buffer. You should be able to match the first line with: /^(.*)$/m (as always, this is PCRE syntax) the /m modifier makes ^ and $ match embedded newlines. Since there’s no /g modifier, it will just process the first occurrence, which is the first line, and … Read more
UPDATE: It fails “with two ff before oo” as @Ciantic pointed out in the comments. ^(f(o[^o]|[^o])|[^f])*$ NOTE: It is much much easier just to negate a match on the client side instead of using the above regex. The regex assumes that each line ends with a newline char if it is not then see C++’s … Read more
I had the exact same necessity, so I adapted the regex from Daniel’s great answer (which is the most accurate I was able to find) to NOT validate hostnames. Here it is: var expression = /((^\s*((([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))\s*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$))/; if (expression.test(valueToTest)) { // good IP } else { // bad IP } I forked Daniel’s original JSFiddle to … Read more
According to Generate a Regular Expression to Match an Arbitrary Numeric Range, and after generating such a regex for your example at Regex_For_Range: \b0*(1[1-9][0-9]|[2-9][0-9]{2}|1[0-9]{3}|2[01][0-9]{2}|22[0-2][0-9]|223[0-4])\b would do the trick. The process would be (still following that Regex generator): First, break into equal length ranges: 110 – 999 1000 – 2234 Second, break into ranges that yield … Read more
To print all lines after, and including, the first match: $ echo -ne ‘apple\nbanana\ncherry\n’ | sed -ne ‘/banana/,$ p’ banana cherry To print all lines after, and NOT including, the first match: $ echo -ne ‘apple\nbanana\ncherry\n’ | sed -e ‘1,/banana/ d’ cherry Filtering lines when pattern matches between “text=” and “status=” can be done with … Read more
I have a complete answer in code for you that’s 95% like FindFiles(string). The 5% that isn’t there is the short names/long names behavior in the second note on the MSDN documentation for this function. If you would still like to get that behavior, you’ll have to complete a computation of the short name of … Read more
You can use capturing groups with alternations matching either string boundaries or a character not _ (still using a word boundary): var re = regexp.MustCompile(`(^|[^_])\bproducts\b([^_]|$)`) s := re.ReplaceAllString(sample, `$1.$2`) Here is the Go demo and a regex demo. Notes on the pattern: (^|[^_]) – match string start (^) or a character other than _ \bproducts\b … Read more
Oh Yes You Can Use Regexes to Parse HTML! For the task you are attempting, regexes are perfectly fine! It is true that most people underestimate the difficulty of parsing HTML with regular expressions and therefore do so poorly. But this is not some fundamental flaw related to computational theory. That silliness is parroted a … Read more