Is Regex Turing Complete?

by | Last updated on January 24, 2024

, , , ,

Programming Languages are typically defined as languages that

are Turing Complete

. Such languages must be able to process any computable function. Regex does not fit into this category.

Is SQL Turing complete?

SQL as such (i.e. the SQL92 standard)

is not turing complete

. However, many of the languages derived from SQL, such as Oracle’s PL/SQL and SQL Server’s T-SQL and others are turing complete.

Is go Turing complete?


GO is EXPTIME-complete

(at least the GO game I consider (Japanese rules), so it falls in the class of decidable problems. This being said, I am unsure if GO could simulate a Turing Machine because that would imply the GO game could determine the decision problem in finite time for any instance.

Is regex compiled?

Compiled Regular Expressions

When the engine executes a regular expression, it interprets the internal codes. If a Regex object is constructed with the RegexOptions. Compiled option, it compiles the regular expression to explicit MSIL code instead of high-level regular expression internal instructions.

What languages are Turing complete?

Most modern programming languages (

e.g. Java, JavaScript, Perl, etc.

) are all Turing complete because they each implement all the features required to run programs like addition, multiplication, if-else condition, return statements, ways to store/retrieve/erase data and so on.

What languages are not Turing complete?

There are no mainstream multi-purpose non Turing complete languages today. There are, however, several non Turing complete domain specific languages.

ANSI SQL

, regular expressions, data languages (HTML, CSS, JSON, etc), and s-expressions are some notable examples.

Is Excel Turing complete?

With the addition of custom functions that can call each other and recursively call themselves,

Excel’s formula language becomes Turing-complete

, effectively meaning that Excel users can compute anything without resorting to another programming language. … You can’t define new functions.

What games are Turing complete?

  • Dwarf Fortress.
  • OpenTTD.
  • Terraria.
  • Minecraft.
  • Minesweeper.
  • LittleBigPlanet.
  • Baba is You.
  • Factorio.

What does the do in regex?

The . * in each lookahead

causes it to initially gobble up the whole string, then backtrack, giving back one character at a time until it reaches a spot where the

d or W can match. That’s how they can match the digit and the special character anywhere in the string.

What is r in regex?

The r means that

the string is to be treated as a raw string

, which means all escape codes will be ignored.

How does regex replace work?

Replace(String, String, String, RegexOptions, TimeSpan) In a specified input string, replaces all strings that match a specified regular expression with a

specified replacement

string. Additional parameters specify options that modify the matching operation and a time-out interval if no match is found.

Can I use C# in Excel?

You can use C# to

create Excel commands

and functions with my ESharper add-in. The code can be edited and executed directly in a live Excel session.

Is VBA Dead 2021?


VBA is not as dead as you think

.

Excel automation can also use TypeScript to create Office Scripts which can be used to automate Excel Online. … In 2020, VBA still shows twice as much interest as a popular programming language that can be used to automate Excel.

Is VBA still used in Excel?

Currently,

there is no way to run VBA on Excel mobile or Excel Online

. JavaScript is extremely fast at pulling data from outside sources. The JavaScript replacement plan is going very slow though and the API still cannot fully replace all the functionality that VBA currently gives us.

Is Pokemon TCG Turing complete?

(Pokemon Yellow)

A Pokemon game, which is finished in 1minute 36seconds. The interesting point about this speedrun is the bug it exploits. Turns out the game logic itself

is Turing-complete

in the sense that you can write assembly by filling the player inventory appropriately.

What does S * mean in regex?

s is fairly simple – it’s a common shorthand in many regex flavours for “

any whitespace character

“. This includes spaces, tabs, and newlines. … The * quantifier is fairly simple – it means “match this token (the character class in this case) zero or more times”.

Charlene Dyck
Author
Charlene Dyck
Charlene is a software developer and technology expert with a degree in computer science. She has worked for major tech companies and has a keen understanding of how computers and electronics work. Sarah is also an advocate for digital privacy and security.