unicode

Provide Unicode hexadecimal ranges for building regex character classes.

3|1|Updated Apr 12, 2026

Search Tags:#emoji #regex #unicode #pcre #character ranges #international text

Ready to run

npx skills add https://github.com/Cogni-AI-OU/cogni-ai-agent-skills --skill unicode

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: unicode
Source: https://github.com/Cogni-AI-OU/cogni-ai-agent-skills/tree/main/unicode
Command: npx skills add https://github.com/Cogni-AI-OU/cogni-ai-agent-skills --skill unicode

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill solves the problem of not knowing which exact Unicode hexadecimal ranges to use when building regex patterns for specific scripts, languages, symbols, or emoji.

Core Features & Use Cases

Unicode range lookup for regex: Provides PCRE-style \x{XXXX}-\x{YYYY} ranges so you can reliably match character blocks like Cyrillic, CJK, Arabic, and emoji.
Script and symbol targeting: Helps you choose the right ranges for international scripts and common symbol/emoji groups when validating or extracting text.
Engine compatibility guidance: Explains compatibility expectations around \x{...} syntax and surrogate-pair limitations in JS/Python depending on the regex engine.

Quick Start

Use the unicode skill to generate the correct regex character class for matching CJK Unified Ideographs in your text search tool.

Frequently Asked Questions about unicode

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I find the correct Unicode character ranges for regex pattern matching?▼

To find Unicode character ranges for regex, use a hexadecimal reference providing PCRE-style syntax like \x{XXXX}-\x{YYYY} to reliably match specific character blocks such as Cyrillic, CJK, or emoji.

Can I use \x{...} syntax to match Unicode text in JavaScript and Python?▼

Using \x{...} syntax for Unicode text matching in JavaScript and Python depends on regex engine compatibility, as this PCRE-style approach may face surrogate-pair limitations and require specific handling.

What is the best way to filter international text by script using regex?▼

Filtering international text by script using regex is best achieved by composing grouped hexadecimal character ranges to target and validate specific scripts like Devanagari or Arabic across multilingual documents.

How do I build a regex character class for matching CJK Unified Ideographs?▼

Building a regex character class for CJK Unified Ideographs requires selecting precise Unicode hexadecimal ranges using PCRE-compatible syntax to accurately extract or validate those specific script characters.

Why does my regex pattern fail to match emoji across different engines?▼

Regex patterns fail to match emoji across different engines due to surrogate-pair pitfalls and limited \x{...} handling in environments like JavaScript or Python, requiring careful range composition to avoid errors.