Peter Kankowski | The Blog Pros

July 4, 2023

Search from the Windows Command Prompt

The FIND Command

To search for text in multiple files from the Windows command prompt or batch files, you can use the FIND command, which has been present since the days of MS DOS and is still available in Windows 11. It's similar to the Unix grep command, but does not support regular expressions. If you want to search for the word borogoves in the current directory, please follow this syntax:

find "borogoves" *

Note that the double quotes around the pattern are mandatory. If you are using PowerShell, you will need to include single quotes as well:

May 11, 2023

Empty Character Class in JavaScript Regexes

I contributed to PCRE and wrote two smaller regular expression engines, but I still regularly learn something new about this topic. This time, it's about a regex that never matches.

When using character classes, you can specify the allowed characters in brackets, such as [a-z] or [aeiouy]. But what happens if the character class is empty?

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