C# Regular Expression Cheat Sheet

Regular expressions are ubiquitous in the developer world. They are used to validate website input, search for word patterns in large strings/texts and for many other uses. In Excel, Regular Expressions (VBA RegEx or simply VBA Regex) are not much advertised. Most users are good with using simple LEFT, RIGHT, MID and FIND functions for their string manipulation. These functions are, however, quite primitive and limited. Knowing how to use Regular Expressions (Regex) in Excel will save you a lot of time. This Excel Regex Tutorial focuses both on using Regex functions and in VBA. Let’s, however, not forget that VBA has also adopted the VBA Like operator which sometimes allows you to achieve some tasks reserved for Regular Expressions.

Regular Expression Cheat Sheet Pdf
C# Regular Expression Cheat Sheet Pdf
C# Regular Expression Cheat Sheet 2019

VBA Strings Manipulations Resources

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I need a regex such that it matches following plus anything ascii above 127 (i.e 7F hex and above). Below works fine for the given range. String pattern = 'x00-x1F'. In set theory, the cardinality of the continuum is the cardinality or 'size' of the set of real numbers, sometimes called the continuum.It is an infinite cardinal number and is denoted by (lowercase fraktur 'c') or.

Excel Regex VBA example

A Regex (Regular Expression) is basically a pattern matching strings within other strings. Let’s demonstrate this with a simple Regex example. Let us assume we have the text below. And we want to capture just the numbers. Without knowing ahead how the text looks like it would be hard to extract these numbers both using Excel Functions and VBA. Below a simple example where we check if the pattern exists in the string.

This is the output result. It returns True as string pattern was found

What does the [0-9]+ pattern represent? It translates to the following: capture any pattern matching the following range of characters ([ ]), being numbers from 0-9, in a sequence of at least 1 or more (+). As you can see a Regex uses a certain code to translate your pattern.

Regular Expression Language

The Regular Expression language (Regex) is quite elaborate but allows you to match virtually any regular language. Below a quick reference:

Matching characters

Syntax	Description	Example	Example match
.	Any character except newline (vbNewLine)	d.g	“dog” in “My dog is named dingo”
[characters]	Matches any provided character between brackets [ ]	[af]	“a” , “f” in “alfa”
[^characters]	Matches any character not being one of the provided between brackets [ ]	[^af]	“a” , “f” in “alfa”
[start–end]	Matches any character belonging to the character range specified between brackets [ ]	[0-9]	“1” and “2” in “12”
w	Any word character (letters, modifiers, digits, punctuation and connectors)	w	“I”, “a” “m” “J” “o” “h” “n” in “I_am.John”
W	Any non-word character	w	“_” and “.” in “I_am.John”
s	Any white space character	s	” ” in “Hi There!”
S	Any non-white space character	S	“M” and “e” in “M e”
d	Any decimal digit	d	“1” and “2” in “12”
D	Any non-decimal digit	D	“d”, “_”, “.” in “d_.”
	Followed by any special character – escapes special characters	.	“.” in “d.g”
r	Tab (vbTab)	r
n	Carriage return / new line (vbNewLine)	n

Quantifiers

Quantifiers allow you to specify the amount of times a certain pattern is supposed to matched against a string. It is important to understand the difference between GREEDY and non-GREEDY quantifiers:

Syntax	Description	Example	Example match
*	Zero or more of (GREEDY). Matches as many as possible	W.*W	“_dogs_cats_” in “_dogs_cats_”
+	One or more of (GREEDY). Matches as many as possible	Ww+W	“_dogs_cats_” in “_dogs_cats_”
?	Zero or once (GREEDY). Matches as many as possible	d?	“1” in “Live1”
{n}	“n” many times	d{2}	“21” and “12” in “212”
{n,}	At least “n” times (GREEDY)	d{2,}	“12” and “123” in “1_12_123”
{n,m}	Between “n” and “m” times (GREEDY)	d{3,4}	“123” and “1234” in “1_12_123_1234”
*?	Zero or more of (non-GREEDY). Matches as few as possible	W.*?W	“_dogs_” and “_cats_” in “_dogs_cats_”
+?	One or more of (non-GREEDY). Matches as few as possible	W.+?W	“_dogs_” and “_cats_” in “_dogs_cats_”
??	Zero or once (non-GREEDY). Matches as few as possible	d??	“1” in “Live1”
{n,}?	At least “n” times (non-GREEDY). Matches as few as possible	d{2,}	“12” and “123” in “1_12_123”
{n,m}?	Between “n” and “m” times (non-GREEDY). Matches as few as possible	d{3,4}	“123” and “1234” in “1_12_123_1234”

Grouping

Below the basic grouping expressions:

Syntax	Description	Example	Example match
(expression)	Group and capture the expression within the parenthesis ( )	([0-9]*)	Captures “123, “345” and “789” within “123-456-789”
(?:expression)	Group BUT DON’T CAPTURE the expression within the parenthesis ( )	(?:[0-9])([A-Z])(?:[0-9]*)	Captures only “hello” in “123hello456”

Using Regex in VBA

To use Regex in VBA you need to use the RegExp object which is defined in the Microsoft VBScript Regular Expressions library. To start using this object add the following reference to your VBA Project: Tools->References->Microsoft VBScript Regular Expressions. Otherwise, if you don’t want to reference this library every time you can also create the RegExp object using the CreateObject function.

Regular Expression Cheat Sheet Pdf

Option 1: Referencing the library Microsoft VBScript Regular Expressions

Quanmax driver download for windows 10. Drivers sierra wireless card reader. Option 2: Using the CreateObject function

I personally prefer using the CreateObject function as it does not require referencing the library every time the Workbook is opened on a new workstation.

The RegExp object has the following properties:

Pattern – The pattern (written in Regex) which you want to match against (e.g. “(.*)”)
IgnoreCase – Ignore letter case (captial/non-capital letters)
Global – Do you want to find all possible matches in the input string? If false, only match the first found pattern. Set false if you need just the first match for performance
MultiLine – Do you want to match the pattern across line breaks?

The RegExp object facilitates the following 3 operations:

Test (string) – returns True if the pattern can be matched agaist the provided string
Replace (search-string, replace-string) – replaces occurrences of the pattern in search-string with replace-string
Execute (search-string) – returns all matches of the pattern against the search-string

Regex: Test pattern against a string

The Test function allows you to test whether the selected Pattern provides any match against the string.

Regex: Replace pattern in a string

The Replace function will replace the first (if Global = False) or all matching patterns (if Global = True) within a certain string with another string of your choosing.

Regex: Match pattern in a string

The Execute function will match the first or all instances of a certain pattern within a certain string. You can also “capture” parts of the patterns as so called “Submatches”.

As you can see we have managed to capture 3 instances of the 123-[0-9]+ pattern in the string. We can also define a “capture” within our pattern to capture parts of the pattern by embracing them with brackets “()”. See the example below:

Regex: Using Regex as an Excel Formula

Excel does not natively provide any Regex functions which often requires creating complex formulas for extracting pieces of strings otherwise easy to extract using Regular Expressions. Hence, to facilitate Regex in Excel you need to use User Defined Functions – functions defined in VBA but accessible as regular functions in Excel. Below find 2 basic UDF functions created just for this use:

Now for an example:
…and the result:

Download Excel Regex example

You can download VBA Regex and other great snippets as part of the VBA Time Saver Kit. Feel free to download the full kit using the link below:

ReFiddle – Online testing your Regex!

Want to test quickly a Regular Expression (Regex)? Use ReFiddle. It is a great tool to quickly validate if a Regex works and to be able to quickly share your regex with others!

Keep in mind, however, that the VBA Regular Expression language (supported by RegExp object) does not support all Regular Expressions which are valid in ReFiddle.

Learn Regex (Regular Expression) the Fun way

Want to learn building Regex (Regular Expressions) and have some fun at the same time?

Try Regex Golf:
Regex Golf

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The Faraday constant, denoted by the symbol F and sometimes stylized as ℱ, is named after Michael Faraday. In chemistry and physics, this constant represents the magnitude of electric charge per mole of electrons.^[1] It has the currently accepted value

F = 96485.33212.. C·mol⁻¹.^[2]

Since 1 mol electrons = 6.02214076×10²³ electrons (Avogadro's number),^[3] the Faraday constant is equal to the elementary chargee, the magnitude of the charge of an electron, multiplied by 1 mole:^[4]

F = 96485.3..C/(1mol) = 96485.3..C/(6.022..×10²³) = 1.60217663410×10⁻¹⁹ C = e

One common use of the Faraday constant is in electrolysis calculations. One can divide the amount of charge in coulombs by the Faraday constant in order to find the chemical amount (in moles) of the element that has been oxidized.

The value of F was first determined by weighing the amount of silver deposited in an electrochemical reaction in which a measured current was passed for a measured time, and using Faraday's law of electrolysis.^[5]

2019 redefinition[edit]

Since the 2019 redefinition of SI base units, which introduced exactly defined values for the elementary charge and the mole, the Faraday constant is exactly

e × (1 mol) mol⁻¹ = 1.602176634×10⁻¹⁹ C × 6.02214076×10²³ mol⁻¹ = 96485.3321233 C·mol⁻¹.

Other common units[edit]

96.485 kJ per volt–gram-equivalent
23.061 kcal per volt–gram-equivalent
26.801 A·h/mol

Faraday unit of charge[edit]

Related to Faraday's constant is the 'faraday', a unit of electrical charge. It is much less common than the coulomb, but sometimes used in electrochemistry.^[6] One faraday of charge is the magnitude of the charge of one mole of electrons, i.e. 96485.33212..C.^[2]

Expressed in faradays, the Faraday constant F equals '1 faraday of charge per mole'.

This faraday unit is not to be confused with the farad, an unrelated unit of capacitance (1 farad = 1 coulomb / 1 volt).

Popular media[edit]

The Simpsons episode 'Dark Knight Court' has Mr. Burns asking Comic Book Guy how much he wants for his entire comic book inventory. He says 'the speed of light expressed as dollars' and Mr. Burns tells Smithers to 'just give him Faraday's Constant'. The check is written for $96,485.34.