Regular Expressions 101

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Community Patterns

2

yyyy/mm/dd

Java 8
^(((\d{3}[1-9]|\d{2}[1-9]\d|\d[1-9]\d{2}|[1-9]\d{3})(\/)(((0[13578]|1[02])(\/)(0[1-9]|[12]\d|3[01]))|((0[469]|11)(\/)(0[1-9]|[12]\d|30))|(02(\/)(0[1-9]|[1]\d|2[0-8]))))|(((\d{2})(0[48]|2468|13579)|((0[48]|2468|3579)00))(\/)02(\/)29))$ Match year/month/day, date format. E.g: 2021/08/25 [match] 2021/...
Submitted by mayl0421 - 3 years ago
2

Markdown Heading

Java 8
Parses the text following a '#' and a space all the way up to the next return character. Additional #'s can be added for parsing of other type of headings!
Submitted by Hansen - 3 years ago
2

Asciidoc PlantUML Block

Java 8
Regex to select PlantUML Block in Asciidoc documents
Submitted by anonymous - 3 years ago
2

Mikrotik firewall logs

Golang
Matching for mikrotik ROS 7 Used in promtail and grafana
Submitted by anonymous - a year ago (Last modified a year ago)
2

Check Email Validity

Java 8
Regular expression to check the email syntax validity. Certainly requires improvement, but it's a good basis to work from. Work with Java and JavaScript.
Submitted by Alain TOMASIAN <alain.tomasian@kaptus.fr> - a year ago (Last modified a year ago)
3

Hostname validation

Golang
Validates subdomain, root domain, and wild card domains
Submitted by AnonymousDapper - 8 years ago
3

Extract URL parts only named capturing groups

Golang
Extract URL parts only named capturing groups
Submitted by dixanms - 3 years ago
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Community Library Entry

2

Regular Expression
.NET 7.0 (C#)

@"
^(?>(?'protocol'[a-zA-Z]+)://)?(?'domain'[a-zA-Z0-9.\-_]*)?(?>:(?'port'\d{1,5}))?/(?'path'[a-zA-Z0-9_\-%]+)(?:(?>\?(?'query'[a-zA-Z0-9_\-=&%]+))()|(?>#(?'anchor'[a-zA-Z0-9_\-%]+))()){0,2}$
"
gm
Open regex in editor

Description

Matches protocol, domain, port, path, query and anchor as named capturing groups.

Submitted by Jonathan - a year ago (Last modified a year ago)