ziishaned/learn-regex

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Meta character	Description
.	Period matches any single character except a line break.
[ ]	Character class. Matches any character contained between the square brackets.
[^ ]	Negated character class. Matches any character that is not contained between the square brackets
*	Matches 0 or more repetitions of the preceding symbol.
+	Matches 1 or more repetitions of the preceding symbol.
?	Makes the preceding symbol optional.
{n,m}	Braces. Matches at least "n" but not more than "m" repetitions of the preceding symbol.
(xyz)	Character group. Matches the characters xyz in that exact order.
\|	Alternation. Matches either the characters before or the characters after the symbol.
\	Escapes the next character. This allows you to match reserved characters `[ ] ( ) { } . * + ? ^ $ \ \|`
^	Matches the beginning of the input.
$	Matches the end of the input.

Shorthand	Description
.	Any character except new line
\w	Matches alphanumeric characters: `[a-zA-Z0-9_]`
\W	Matches non-alphanumeric characters: `[^\w]`
\d	Matches digits: `[0-9]`
\D	Matches non-digits: `[^\d]`
\s	Matches whitespace characters: `[\t\n\f\r\p{Z}]`
\S	Matches non-whitespace characters: `[^\s]`

Flag	Description
i	Case insensitive: Match will be case-insensitive.
g	Global Search: Match all instances, not just the first.
m	Multiline: Anchor meta characters work on each line.

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