![]() Only alpha, charlie, and delta match so those are the only ones that are printed. To deconstruct that regex, it first matches on a start of a line ^ and then looks for strings that do not match brav to follow afterwards. So using the example above, you can do something like this to get results you want without using grep flags. To do this you would use something known as a negative look-ahead regex: (?!). I wanted to add that using PCRE it is possible to use just regex to filter out using negate expressions. (Kanvuanza's answer)Īs you can see there were no files listed because all the files in this directory included at least one letter from that class. While searching and matching the upper case and lower case letters differ and do not match the upper case pattern with the lower case string. ![]() protected static boolean recursive false / Construct a Grep object for the pattern. My memory is not good, so the example might not work: find -name 'foo' xargs grep 'pattern' Find is flexible, you can use wildcards, ignore case, or use regular expressions. Problems and Solutions for Java Developers Ian F. To accomplish what you are trying to do, you can combine find, xargs, and grep commands. That will keep any files from showing up that have any of those characters. Januby smail Baydan The grep tool is used to search and match the specified Patterns in a file or string. I thinks grep does not have filename filtering. So as Kanvuanza said, to grep for the inverse of "term" as opposed to the characters t e r m you should do it using grep -v.Īlso if you don't want the files that have any characters in the class use grep -v ''. ![]() If you notice it included the entire directory listing because all the files had at least one letter that was not included in the character class. Now if I run ls |grep '^' I get the following: $ ls |grep '^'Īs you can see, not only did I get brave and bravo I also got alpha because the character class will get any letter from that list.Ĭonsequently, if I run ls |grep '' I will get all the files that do not contain the characters b r a v anywhere in the name. Take the following directory for instance: $ ls This means if a file has other letters in its name it will still appear in the output of ls. When you run ls /directory | grep '' you are essentially grepping for not the letters t e r m. ![]()
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