regex

Regular Expressions in C

By Karunesh Johri • Updated: February 20, 2023

1.0 Introduction Regular expressions are used for searching strings in text files. A regular expression is a string of characters and may contain certain metacharacters. A metacharacter has a special meaning. A regular expression denotes a set of strings. Or, in other words, there is a set of strings that are matched by it. The …

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Tags: example program, regcomp, regerror, regex, regexec, regexp, regfree, regular expression

vi text editor in Linux

By Karunesh Johri • Updated: February 27, 2023

vi is a classic text editor that has been available with Unix systems right from the beginning. vi has been a very popular text editor and one can edit files very efficiently using it. In this tutorial, we look at some of the vi commands that make it such a powerful editor. Since vim (vi-improved) …

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Tags: bash, command mode, copy, cut, editor, ex mode, insert mode, paste, regex, search, shell, vi, vim