Regular Expressions 101

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Community Patterns

27

Parsing browser User Agents

PCRE (PHP <7.3)
From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.
Submitted by OnlineCop - 10 years ago (Last modified a year ago)
33

Strict Password Validator

ECMAScript (JavaScript)
This regex matches only when all the following are true: password must contain 1 number (0-9) password must contain 1 uppercase letters password must contain 1 lowercase letters password must contain 1 non-alpha numeric number...
Submitted by qho - 7 years ago (Last modified a year ago)
13

CSS Color Matcher

ECMAScript (JavaScript)
Pattern matching and extracting color code formats using RegEx. https://github.com/Kyza/color-regex/
Submitted by Kyza - a year ago
30

Cron schedule

Recommended
PCRE (PHP <7.3)
Validate cron lines (even the ones commented out)
Submitted by anonymous - 8 years ago
20

best youtube id match ( iframe embed replace ready )

Recommended
PCRE (PHP <7.3)
MATCH ANY YOUTUBE ID author : mi-ca v1.0 – 2017.03.08 This Regex match any youtube url and grab the ID. Embed ready √ --...
Submitted by mi-ca.ch - 6 years ago
1...899900901

Community Library Entry

3

Regular Expression
PCRE (PHP <7.3)

/
(?(DEFINE) (?<exprs> (?&expr)(\s+(?&bool)\s+((?&expr)|\(\s*(?&exprs)\s*\)))* ) (?<expr> (?&valleft)\s?(?&comp)\s?(?&valright) ) (?<comp> ((!=)|(==)|(<=)|(>=)|(<)|(>)){1} ) (?<valleft> (?&not)[\w\.]+ ) (?<valright> [\w\.]+ ) (?<bool> (and|or) ) (?<not> (not\s+)?) ) (?&exprs)
/
xmi
Open regex in editor

Description

comapre simbols used just !=, ==, <=, >=, <, > beacose of task keyword "not" can be used only before leftside value beacose of task

Submitted by Ilya Filisteev - 9 years ago