Unicode Propiedad Escapes en Regex

General Categories

Unicode property escapes of the form backslash-p{Category} match characters belonging to a Unicode general category or binary property. These require the Unicode flag u on the regular expression. General categories include Letter, Number, Punctuation, and Symbol, with subcategories like Uppercase_Letter and Decimal_Number. Property escapes enable matching by semantic class rather than code point ranges, which is more robust across Unicode versions.

\p{L}

Any letter, any script

matches A, 中, ا

\p{N}

Any number, any script

matches 1, ٢, Ⅷ

\p{P}

Any punctuation

matches ., ，, 。

\p{Sc}

Currency symbol

matches $, €, ¥

\p{Script=Han}

Characters of the Han script

matches Chinese chars

Binary Properties

Binary properties are boolean attributes that a character either has or lacks. Common binary properties include White_Space, Alphabetic, Emoji, and Emoji_Presentation. The Emoji property is useful for matching emoji code points, though combining sequences require additional handling. Negated property escapes use capital P and match characters lacking the property. Binary properties are stable across Unicode versions more than general categories.

Script Segmentation

The Script property identifies the writing system of a character, such as Latin, Cyrillic, or Han. The Script_Extensions property handles characters used in multiple scripts, such as digits shared between scripts. Matching by script is useful for validating input in a specific language or segmenting mixed-script text. The Unicode flag is mandatory for property escapes, and omitting it causes a syntax error rather than a silent ASCII-only match.