The document provides an overview of regular expressions in JavaScript, explaining their components and functionality. It details various regex modifiers such as 'g' for global match and 'i' for case-insensitive matching, along with metacharacters and quantifiers. Additionally, it covers object properties and methods related to regular expressions, including exec(), test(), and compile().

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2. JAVASCRIPT REGEX
MODIFIERS
BRACKETS
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METACHARACTERS
QUANTIFIERS
OBJECT PROPERTIES
OBJECT METHODS

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4. A Regular Expression is a sequence of characters that constructs a search pattern. When you search for data in a text,
you can use this search pattern to describe what you are looking for.
What are Regular Expressions?
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6. g It performs a global match
i It performs case-insensitive matching
m It performs multiline matching
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8. [abc] Finds any character between the brackets
[^abc] Finds any character NOT between the brackets
[0-9] Finds any digit between the brackets
[^0-9] Finds any non-digit NOT between the brackets
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10. w It looks for a word character
W It finds a non-word character
d It finds a digit
D It finds a non-digit Character
s It finds a whitespace character
S It finds a non-whitespace character
b It finds a match at the beginning/end of a word
B It looks for a match, but not at the beginning/end of a word
f It finds a form feed character
r It finds a carriage return character
v It finds a vertical tab character
t It finds a tab character
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12. n+ It matches any string that contains at least one n
n* It matches any string that contains zero or more occurrences of n
n? It matches any string that contains zero or one occurrence of n
n{X} It matches any string that contains a sequence of X n’s
n{X,Y} It matches any string that contains a sequence of X to Y n’s
n{X,} It matches any string that contains a sequence of at least X n’s
n$ It matches any string with n at the end of it
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14. Constructor Returns the function that creates the RegExp object’s prototype
global Checks whether the “g” modifier is set
ignoreCase Checks whether the “i” modifier is set
lastIndex Specifies the index at which to start the next match
multiline Checks whether the “m” modifier is set
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16. Compile() It compiles a regular expression
exec() It tests for a match in a string and returns the first match
test() It tests for a match in a string and returns true or false
toString() It returns the string value of the regular expression
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