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

0

Regular Expression
Python

r"
[^\d\.](((01|03|07|11|13|17|19|21|23|25|27|29|31|33|35|37|39|43|45|47|49|53|55|59|61|65|67|71|73|75|77|79|81|83|85|87|91|93|95|97|99)[\. ]?[\dX]{3}[\. ]?[\dX]{2}[\. \-]?[\dX]{2}|(01|03|07|11|13|17|19|21|23|25|27|29|31|33|35|37|39|43|45|47|49|53|55|59|61|65|67|71|73|75|77|79|81|83|85|87|91|93|95|97|99)[\. ]?[\dX]{3}[\. ]?[\dX]{2}|(01|03|07|11|13|17|19|21|23|25|27|29|31|33|35|37|39|43|45|47|49|53|55|59|61|65|67|71|73|75|77|79|81|83|85|87|91|93|95|97|99)[\. ]?[\dX]{3})(?![\d\.X]))|([^\d\.](01|03|07|11|13|17|19|21|23|25|27|29|31|33|35|37|39|43|45|47|49|53|55|59|61|65|67|71|73|75|77|79|81|83|85|87|91|93|95|97|99)(?![\d\.X]|( ?%)))
"
gm
Open regex in editor

Description

Matches code including character before the code which must NOT be a digit, dot or minus. Therefore, before analyzing a string, add a space in front of it and after analyzing remove the first character of each match. Lookbehind is not used because VBA doesn't support it.

Submitted by Guido Witt-Dörring - 2 years ago (Last modified 2 years ago)