Expression	Syntax	Long Name	Description
Letter	:L	Letter	Matches any letter, Ll | Lm | Lo | Lt | Lu
Uppercase letter	:Lu	Uppercase_Letter	Matches any one capital letter. For example, :Luhe matches “The” but not “the”.
Lowercase letter	:Ll	Lowercase_Letter	Matches any one lower case letter. For example, :Llhe matches “the” but not “The”.
Title case letter	:Lt	Titlecase_Letter	Matches characters that combine an uppercase letter with a lowercase letter, such as Nj and Dz.
Modifier letter	:Lm	Modifier_Letter	Matches letters or punctuation, such as commas, cross accents, and double prime, used to indicate modifications to the preceding letter.
Other letter	:Lo	Other_Letter	Matches other letters, such as gothic letter ahsa.
Cased letter	:LC	Cased_Letter	Matches any letter with case, Ll | Lt | Lu
Mark	:M	Mark	Matches any mark, Mc | Me | Mn
Non-spacing mark	:Mn	Nonspacing_Mark	Matches non-spacing marks.
Combining mark	:Mc	Spacing_Mark	Matches combining marks.
Enclosing mark	:Me	Enclosing_Mark	Matches enclosing marks.
Number	:N	Number	Matches any number, Nd | Nl | No
Decimal digit	:Nd	Decimal_Number	Matches decimal digits such as 0-9 and their full-width equivalents.
Letter digit	:Nl	Letter_Number	Matches letter digits such as roman numerals and ideographic number zero.
Other digit	:No	Other_Number	Matches other digits such as old italic number one.
Punctuation	:P	Punctuation	Matches any puncutation, Pc | Pd | Pe | Pf | Pi | Po | Ps
Connector punctuation	c	Connector_Punctuation	Matches the underscore or underline mark.
Dash punctuation	d	Dash_Punctuation	Matches the dash mark.
Open punctuation	s	Open_Punctuation	Matches opening punctuation such as open brackets and braces.
Close punctuation	e	Close_Punctuation	Matches closing punctuation such as closing brackets and braces.
Initial quote punctuation	i	Initial_Punctuation	Matches initial double quotation marks.
Final quote punctuation	f	Final_Punctuation	Matches single quotation marks and ending double quotation marks.
Other punctuation	o	Other_Punctuation	Matches commas (,), ?, “, !, @, #, %, &, *, \, colons (:), semi-colons (;), ‘, and /.
Symbol	:S	Symbol	Matches any symbol, Sc | Sk | Sm | So
Math symbol	:Sm	Math_Symbol	Matches +, =, ~, |, <, and >.
Currency symbol	:Sc	Currency_Symbol	Matches $ and other currency symbols.
Modifier symbol	:Sk	Modifier_Symbol	Matches modifier symbols such as circumflex accent, grave accent, and macron.
Other symbol	:So	Other_Symbol	Matches other symbols, such as the copyright sign, pilcrow sign, and the degree sign.
Separator	:Z	Separator	Matches any separator, Zl | Zp | Zs
Paragraph separator	:Zp	Paragraph_Separator	Matches the Unicode character U+2029.
Space separator	:Zs	Space_Separator	Matches blanks.
Line separator	:Zl	Line_Separator	Matches the Unicode character U+2028.
Other control	:Cc	Control	Matches end of line.
Other format	:Cf	Format	Formatting control character such as the bidirectional control characters.
Surrogate	:Cs	Surrogate	Matches one half of a surrogate pair.
Other private-use	:Co	Private_Use	Matches any character from the private-use area.
Other not assigned	:Cn	Unassigned	Matches characters that do not map to a Unicode character.

References:

unicode.org

Unicode Character Properties

Unicode Regular Expressions

Unicode Property Aliases 

Perl Regular Expressions

PCRE