I often need to kill a process during programming. The way I do it now is: [~]$ ps aux | grep ‘python csp_build.py’ user 5124 1.0 0.3 214588 13852 pts/4 Sl+ 11:19 0:00 python csp_build.py user 5373 0.0 0.0 8096 960 pts/6 S+ 11:20 0:00 grep python csp_build.py [~]$ kill 5124 How can I extract … Read more
This question already has answers here: Regular expression to match a line that doesn’t contain a word (31 answers) Closed 2 years ago. I know that I can negate group of chars as in [^bar] but I need a regular expression where negation applies to the specific word – so in my example how do … Read more
Obviously, you can use the | (pipe?) to represent OR, but is there a way to represent AND as well? Specifically, I’d like to match paragraphs of text that contain ALL of a certain phrase, but in no particular order. 14 s 14 You need to use lookahead as some of the other responders have … Read more
How can I check if a given string is a valid URL address? My knowledge of regular expressions is basic and doesn’t allow me to choose from the hundreds of regular expressions I’ve already seen on the web. 59 s 59
I’m trying to put together a comprehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following: 1-234-567-8901 1-234-567-8901 x1234 1-234-567-8901 ext1234 1 (234) 567-8901 1.234.567.8901 1/234/567/8901 12345678901 I’ll answer with my current attempt, but I’m hoping somebody has something better and/or more elegant. 42 … Read more
Is it possible to detect a valid regular expression with another regular expression? If so please give example code below. 9 s 9 / ^ # start of string ( # first group start (?: (?:[^?+*{}()[\]\\|]+ # literals and ^, $ | \\. # escaped characters | \[ (?: \^?\\. | \^[^\\] | [^\\^] ) … Read more
I have been trying to work out the syntax for this command: grep ! error_log | find /home/foo/public_html/ -mmin -60 OR: grep ‘[^error_log]’ | find /home/baumerf/public_html/ -mmin -60 I need to see all files that have been modified except for those named error_log. I’ve read about it here, but only found one not-regex pattern. 3
How are non-capturing groups, i.e., (?:), used in regular expressions and what are they good for? 1 18 Let me try to explain this with an example. Consider the following text: http://stackoverflow.com/ https://stackoverflow.com/questions/tagged/regex Now, if I apply the regex below over it… (https?|ftp)://([^/\r\n]+)(/[^\r\n]*)? … I would get the following result: Match “http://stackoverflow.com/” Group 1: “http” … Read more
Over the years I have slowly developed a regular expression that validates most email addresses correctly, assuming they don’t use an IP address as the server part. I use it in several PHP programs, and it works most of the time. However, from time to time I get contacted by someone that is having trouble … Read more
I know it’s possible to match a word and then reverse the matches using other tools (e.g. grep -v). However, is it possible to match lines that do not contain a specific word, e.g. hede, using a regular expression? Input: hoho hihi haha hede Code: grep “<Regex for ‘doesn’t contain hede’>” input Desired output: hoho … Read more
