regex

Use when writing or debugging regular expressions for pattern matching, validation, search, and text transformation. Covers regex syntax, common patterns, lookahead/lookbehind, character classes, quantifiers, and differences between regex flavors (PCRE, JavaScript, Python, .NET, POSIX). USE FOR: regular expressions, regex, pattern matching, text validation, search and replace, PCRE, regex lookahead, regex lookbehind, character classes, quantifiers, capturing groups, non-capturing groups, regex anchors DO NOT USE FOR: HTML/XML parsing (use a proper parser), complex data extraction (use jq or a programming language), natural language processing

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Repositorio: Tyler-R-Kendrick/agent-skills
Última actividad en el origen: 11 de febrero de 2026 a las 05:14
Idioma detectado de SKILL.md: inglés
Estrellas: 10
Forks: 4

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name	regex
description	Use when writing or debugging regular expressions for pattern matching, validation, search, and text transformation. Covers regex syntax, common patterns, lookahead/lookbehind, character classes, quantifiers, and differences between regex flavors (PCRE, JavaScript, Python, .NET, POSIX). USE FOR: regular expressions, regex, pattern matching, text validation, search and replace, PCRE, regex lookahead, regex lookbehind, character classes, quantifiers, capturing groups, non-capturing groups, regex anchors DO NOT USE FOR: HTML/XML parsing (use a proper parser), complex data extraction (use jq or a programming language), natural language processing
license	MIT
metadata	{"displayName":"Regular Expressions","author":"Tyler-R-Kendrick"}
compatibility	claude, copilot, cursor
references	[{"title":"Regular-Expressions.info","url":"https://www.regular-expressions.info"},{"title":"PCRE2 Specification","url":"https://www.pcre.org/current/doc/html/"}]

Regular Expressions

Overview

Regular expressions are a cross-cutting skill used in every language, every editor, every CLI tool, and every CI pipeline. They are powerful for pattern matching but can be cryptic — this skill provides a readable reference.

Element	Syntax	Description	Example
Literal	`abc`	Matches "abc"	`abc` matches "abc"
Dot	`.`	Any single character	`a.c` matches "abc", "a1c"
Start anchor	`^`	Start of string/line	`^Hello` matches "Hello world"
End anchor	`$`	End of string/line	`world$` matches "Hello world"
Word boundary	`\b`	Word boundary	`\bcat\b` matches "cat" not "scatter"
Character class	`[abc]`	Any of a, b, or c	`[aeiou]` matches vowels
Range	`[a-z]`	Any char in range	`[0-9]` matches digits
Negated class	`[^abc]`	Any char NOT in set	`[^0-9]` matches non-digits
Shorthand	`\d \w \s`	Digit, word char, whitespace	`\d+` matches "123"
Quantifier	`* + ? {n}`	Repetition	`a{3}` matches "aaa"
Alternation	`\|`	OR	`cat\|dog` matches either
Group	`()`	Capturing group	`(ab)+` matches "abab"
Non-capturing	`(?:)`	Group without capture	`(?:ab)+` matches "abab"
Escape	`\`	Literal special char	`\.` matches "."

Quantifier	Meaning	Greedy	Lazy
`*`	0 or more	`.*`	`.*?`
`+`	1 or more	`.+`	`.+?`
`?`	0 or 1	`.?`	`.??`
`{n}`	Exactly n	`a{3}`	—
`{n,}`	n or more	`a{2,}`	`a{2,}?`
`{n,m}`	Between n and m	`a{2,4}`	`a{2,4}?`

Class	Matches	Equivalent
`\d`	Digit	`[0-9]`
`\D`	Non-digit	`[^0-9]`
`\w`	Word character	`[a-zA-Z0-9_]`
`\W`	Non-word character	`[^a-zA-Z0-9_]`
`\s`	Whitespace	`[ \t\n\r\f\v]`
`\S`	Non-whitespace	`[^ \t\n\r\f\v]`

Purpose	Pattern	Notes
Email (simplified)	`[\w.+-]+@[\w-]+\.[\w.]+`	Covers most common formats
URL	`https?://[\w\-.]+(:\d+)?(/[\w\-./?%&=]*)?`	HTTP and HTTPS
IPv4	`\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b`	Does not validate range
ISO date	`\d{4}-\d{2}-\d{2}`	YYYY-MM-DD format
UUID	`[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}`	Lowercase hex
US phone	`\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}`	With optional formatting
Semantic version	`\d+\.\d+\.\d+(-[\w.]+)?(\+[\w.]+)?`	Major.Minor.Patch with optional pre-release
Strong password	`^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[@$!%?&])[A-Za-z\d@$!%?&]{8,}$`	Min 8 chars, upper, lower, digit, special

Type	Syntax	Description
Positive lookahead	`(?=...)`	Matches if followed by
Negative lookahead	`(?!...)`	Matches if NOT followed by
Positive lookbehind	`(?<=...)`	Matches if preceded by
Negative lookbehind	`(?<!...)`	Matches if NOT preceded by

regex

Opciones de instalación

Revisa los archivos de origen

Regular Expressions

Overview

Regular Expressions

Overview

Core Syntax

Quantifiers

Character Classes

Common Patterns

Lookahead and Lookbehind

Practical Examples

Flavor Differences

Testing and Debugging

Best Practices

Feature	JavaScript	Python	PCRE (.NET/PHP/grep -P)	POSIX (grep/sed)
Named groups	`(?<name>)`	`(?P<name>)`	`(?P<name>)` or `(?<name>)`	Not supported
Lookbehind	Fixed-length only	Variable-length	Variable-length	Not supported
Unicode	`\p{L}`	`\p{L}` with `re.UNICODE`	`\p{L}`	Limited
Backreferences	`\1`	`\1`	`\1`	`\1`

regex

Datos de origen

Opciones de instalación

Revisa los archivos de origen

Más de este repositorio

Más de este repositorio

Regular Expressions

Overview

Regular Expressions

Overview

Core Syntax

Quantifiers

Character Classes

Common Patterns

Lookahead and Lookbehind

Practical Examples

Flavor Differences

Testing and Debugging

Best Practices