WhatIs.com definitions, computer terms, tech glossaries and cheat sheets - We are the leading online tech dictionary and encyclopedia Top Stories 2026 tech job market statistics and outlook The tech sector faced layoffs, rapid AI growth and skill gaps. What's next for 2026? Explore key trends, predictions and stats shaping the future of the tech job market. Explaining an AI bubble burst and what it could mean As stock market turbulence sparks speculation of an AI bubble burst, the tech industry faces a critical shift, with inflated expectations turning to a review of AI's potential. Binance money laundering scandal explained: What to know CEO Changpeng Zhao wanted Binance to be the world's largest cryptocurrency exchange; however, the U.S. filed criminal charges due to lax compliance and money laundering schemes. How U.S. tariffs are reshaping the tech landscape The Trump Administration's tariffs levy a minimum 10% tax on global imports, heavily affecting tech industry supply chains. View All Learning Content Browse Definitions By Topic In-Depth Guides New & Updated Definitions Tech News your123 - stock.adobe.com Close
Top 100 Network Security Tools Tus trucos. Todo tipo de trucos Computing Dictionary Sculpting text with regex, grep, sed and awk Theory: Regular languages Many tools for searching and sculpting text rely on a pattern language known as regular expressions. The theory of regular languages underpins regular expressions. (Caveat: Some modern "regular" expression systems can describe irregular languages, which is why the term "regex" is preferred for these systems.) Regular languages are a class of formal language equivalent in power to those recognized by deterministic finite automata (DFAs) and nondeterministic finite automata (NFAs). [See my post on converting regular expressions to NFAs.] In formal language theory, a language is a set of strings. For example, {"foo"} and {"foo", "foobar"} are formal (if small) languages. (Mathematicians don't typically put quotes around a string, preferring to let the fixed-width typewriter font distinguish it as one, but I'm guessing that programmers are more comfortable with the quotes around strings.) In regular language theory, there are two atomic languages: Useful grep flags The +? #!
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