I think we can agree at they are both hard to read. PS > 'teststring'.Substring (0,4) Test PS > 'teststring'.Substring (4) stringPS >. If only one argument is provided, it is taken to be the starting position, and the remainder of the string is outputted. cat test.txt | foreach-object | sort | gu The Substring method provides us a way to extract a particular string from the original string based on a starting position and length. There's also a lot of different ways to do this in PowerShell, but since he used RegExes, who am I to disagree?įirst, here's the one line answer. There always is, right? With regular expressions, sometimes someone just types and Shakespeare pops out. I'm old, but I'm not an expert in grep and sed so I'm sure there are ways he could have done it more tersely. Something like this: grep ".*" test.txt | sed -e "s/^.*"| cut -f1 -d" fancyresults.txt Basically he had this crazy text file with some fragments of XML within it and wanted the values in-between elements: " He wants this value." He was sifting through crap for some values. However, turns out my friend was actually trying to retrieve values within poorly-formed XML fragments within a larger SQL dump file. You have to pipe multiple commands together one command to transverse the directories, and one command to look for the pattern within each file found. The first line gets the feed and the second line gets all the items. With the introduction of PowerShell, Windows has given us the grep functionality albeit with a much less finesse than the Linux equivalent. However, he said XML, and well, PowerShell rocks XML.īecause it's a dynamic language, you can refer to XML nodes just like this: $a = ((new-object net.webclient).downloadstring("")) You use the same approach as the credit card number example by using a 3-3-4 format. You can use a regular expression to check if a string holds a phone number. You use conditional statements in PowerShell to determine a true or false evaluation. You can use Select-String similar to grep in UNIX or findstr.exe in Windows. How to work with the PowerShell -match operator. Nah, not really as I worked at Nike on Unix for a number of years and I get the power of sed and awk and what not. Description The Select-String cmdlet uses regular expression matching to search for text patterns in input strings and files. Now, of course, I took this immediately as a personal challenge and rose up in a rit of fealous jage and defended my employer. one teeny-tiny unix command grabbed certain values from an XML doc for me." "That decade I spent in the Windows world stunted my growth. "You've got a problem, and you've decided to use regular expressions to solve it.Ī friend of mine was talking on a social network and said something like: There's a wonderful old programmers joke I've told for years:
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