posix-ere

问题 I'm stumped! Trying to write an awk regex to match a string against 11 digits. I've tried: if (var ~ /^[0-9]{11}$/ ) if (var ~ /^([0-9]){11}$/ ) if (var ~ /^([0-9]{11})$/ ) if (var ~ /^[0-9]{11}/ ) # altho I really do need to check the whole str if (var ~ /[0-9]{11}/ ) If I use this.... if (var ~ /^[0-9]+/ ) Then I get a match - but I need to check for exactly 11 digits. 回答1: You described your problem, but didn't tell us your awk version. It is an important information. but this may work for

问题 I've seen a solution for not having to rework usage of the ereg function for PHP 5.3: Good alternative to eregi() in PHP It uses if(!function_exists.... Is there a function that can be used in this way for ereg_replace ? ereg_replace("<!--.*-->","",$str); ereg_replace("[^a-z,A-Z]", "", $str); 回答1: Use the PCRE function preg_replace instead: preg_replace("/<!--.*-->/", "", $str); preg_replace("/[^a-z,A-Z]/", "", $str); POSIX ERE is (nearly) a complete subset of PCRE. So you can use (nearly)

问题 The PHP manual for split() says This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged...Use explode() instead. But I can't find a difference between split() and explode() . join() hasn't been deprecated, so what gives? 回答1: It's been deprecated because explode() is substantially faster because it doesn't split based on a regular expression, so the string doesn't have to be analyzed by the regex parser preg_split() is faster and uses PCRE regular

问题 How can I convert ereg_replace(".*\.(.*)$","\\1",$imgfile); to preg_replace... ? ? I'm having trouble with it? 回答1: preg_replace("/.*\.(.*)$/", "\\1", "foo.jpg") I don't know why PHP requires the / delimiters. The only reason Perl, JS, etc. have them is that they allow regex literals, which PHP doesn't. 回答2: You should know 4 main things to port ereg patterns to preg: Add delimiters (/): 'pattern' => '/pattern/' Escape delimiter if it is a part of the pattern: 'patt/ern' => '/patt\/ern/'

问题 This question already has answers here : How can I convert ereg expressions to preg in PHP? (4 answers) Closed 7 months ago . I'm sorry to ask a question but I am useless when it comes to understanding regex code. In a php module that I didn't write is the following function function isURL($url = NULL) { if($url==NULL) return false; $protocol = '(http://|https://)'; $allowed = '([a-z0-9]([-a-z0-9]*[a-z0-9]+)?)'; $regex = "^". $protocol . // must include the protocol '(' . $allowed . '{1,63}\.

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: How can I convert ereg expressions to preg in PHP? I need help, below is a small VERY basic regex to somewhat validate an email, I do realize it does not work the greatest but for my needs it is ok for now. It currently uses PHP's eregi function which php.net says is now a depreciated function and I should use preg_match instead, simply replacing erei with preg_match does not work, can someone show me how to

问题 luajit -v LuaJIT 2.1.0-beta3 -- Copyright (C) 2005-2017 Mike Pall. http://luajit.org/ I want to negate match the version part, and got LUAJIT_VERSION="2.1.0-beta3" at the beginning of bash script. I use: if ! [[ "$(luajit -v)" =~ LuaJIT\s+"$LUAJIT_VERSION".* ]]; then #rest of code But it seems not working whether I put $LUAJIT_VERSION between "" or not : Any part of the pattern may be quoted to force the quoted portion to be matched as a string ... If the pattern is stored in a shell variable

问题 I am trying to parse some HTML snippets and want to clean them up for various reasons (XSS et al). I am currently trying to remove all of the attributes on any tag, except for the href on a anchor. I am doing this using a sequence of eregi_replace calls, but I am sure there is a smarter way of doing this using preg_replace and just a couple of lines of code, but I have not been able to get it to work. Can anyone help? Current code: $data_item = eregi_replace("<p[^>]*>","<p>", $data_item);

问题 While working on an embedded project; during changing of the scheduling policy from SCHED_OTHER to SCHED_RR I am getting timer issues and stream loading delays. Some issues are not coming during SCHED_OTHER but arriving at SCHED_RR (round robin). What effect will occur while changing the scheduling policies . What do I need to take care of when implementing kernel module in embedded projects during policy changes? 回答1: SCHED_RR is with a time slice so if the process completes the time slice

问题 I am trying to create a regular expression using POSIX (Extended) Regular Expressions that I can use in my C program code. Specifically, I have come up with the following, however, I want to exclude the word "http" within the matched expressions. Upon some searching, it doesn't look like POSIX makes it obvious for catching specific strings. I am using something called a "negative look-a-head" in the below example (i.e. the (?!http:) ). However, I fear that this may only be something available