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Posted by jpluimers on 2017/08/29
I’m not fond of them, but sometimes they can do their job regex – Regular expression to match DNS hostname or IP Address? – Stack Overflow
Two notes:
Posted in Development, RegEx, Software Development | Leave a Comment »
Posted by jpluimers on 2017/03/01
Every time I need to use JavaScript there’s this tiny voice in the back of my head “Please don’t”, for instance because of
JavaScript has two sets of equality operators:
===and!==, and their evil twins==and!=.
This time it did it again: I used JavaScript. My need was to verify a basic URI in JavaScript, so I wrote this function based on RFC 3986 [WayBack] which in Appendix B has a nice regular expression: ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
function isValidUri(uri){
var uriRegExPattern = "^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?";
var uriRegEx = new RegExp(uriRegExPattern);
return (uriRegEx.test(uri));
}
It would crash. But JavaScript is JavaScript, so even a site like JSFiddle wouldn’t show an error (later I found out that enabling the console on http://jsbin.com/wamavacuco/edit?html,console,output does show the error in the console complete with stack trace).
Posted in Development, JavaScript/ECMAScript, JSON, RegEx, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2016/09/22
For my own reference as RegEx is a write-only language:
Search for pipes means just back-slash escaping them:
grep "\|S\|" products.txt > s-rated-products.txt
Search for optional charactes (in this case searching for both the singular and plural form of a word) can be done by grouping the optional part in parentheses:
grep -i "Movie(s)?" products.txt > movie-products.txt
Search for either OR:
grep -E "foo|bar" products.txt > foo-or-bar-products.txt
egrep "foo|bar" products.txt > foo-or-bar-products.txt
Note that the Borland grep does not support the OR syntax, but egrep does.
–jeroen
via:
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Posted by jpluimers on 2016/04/27
Usually I use the old Borland grep.exe that still ships with Delphi. Too bad it is 16-bit app which does not recognise Unicode.
FindStr does. Though much slower and with limited regular expression capabilities, can do recursive searches too:
findstr /spin /c:"string to find" *.*
The /spin is a shortcut for these case insensitive command-line options (the full list of possible options is below):
/S Searches for matching files in the current directory and all
subdirectories.
/I Specifies that the search is not to be case-sensitive.
/N Prints the line number before each line that matches.
/P Skip files with non-printable characters.
Sometimes I leave out the /P to include binary files.
–jeroen
via:
Posted in Batch-Files, Development, Power User, RegEx, Scripting, Software Development, Windows, Windows 7, Windows 8, Windows 8.1, Windows NT, Windows Server 2000, Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Vista, Windows XP | Leave a Comment »
Posted by jpluimers on 2016/01/26
Greate stuff:
Online .NET regular expression tester with real-time highlighting and detailed results output.
Allowed me to quickly verify the pattern PWWWC\d\dFE\d\d_\d\d\d\d-\d\d-\d\d\.zip matches only one of these filenames:
PWWWC07RI01_2016-01-10.zip
PWWWC08FE03_2016-01-04.zip
PAPPC00BT01_2016-01-04.zip
–jeroen
Source: .NET Regex Tester – Regex Storm
Posted in .NET, Development, RegEx, Software Development | Leave a Comment »
