Regular Expressions 101

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Community Patterns

1

Match fluid-width-video-wrapper YouTube video

PCRE (PHP <7.3)
no description available
Submitted by Erica Franz - 9 years ago
1

Match URL

ECMAScript (JavaScript)
no description available
Submitted by http://piecedigital.github.io - 9 years ago
1

Season and episode extractor

Python
extract form the name of a tvseries file the season ande episode
Submitted by 0b1w4n - 9 years ago
1

\A(?:[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-9!#$%&'*+/=?^_`{|}~-

ECMAScript (JavaScript)
fasfasfsafas
Submitted by anonymous - 9 years ago
1

dfrgeagtcer

PCRE (PHP <7.3)
regcergtecrhcethgeargerer
Submitted by regerhsrthrstchrtxhdrsxthjsrthrthrth - 9 years ago
1

Polynomials regex

PCRE (PHP <7.3)
Decompose polynomials of type +/- NUMBERx ^ NUMBER
Submitted by anonymous - 9 years ago
1

Positive lookahead

PCRE (PHP <7.3)
finds the first bar (Find "bar" which has "bar" after it)
Submitted by anonymous - 9 years ago
1

positive lookahead and positive lookbehind

PCRE (PHP <7.3)
Look ahead Positive(?=) Find expression A where expression B follows A(?=B) ...
Submitted by anonymous - 9 years ago
1

POSITIVE LOOK AHEAD AND POSITIVE LOOK BEHIND

PCRE (PHP <7.3)
Look ahead Positive(?=) Find expression A where expression B follows A(?=B) ...
Submitted by anonymous - 9 years ago
1

Positive Look ahead and Look Behind

PCRE (PHP <7.3)
Look ahead Positive(?=) Find expression A where expression B follows A(?=B) ...
Submitted by Rajesh - 9 years ago
1

Atomic group

PCRE (PHP <7.3)
Atomic Groups are non-capturing and once a match is made will exit the atomic group and throw away all backtracks. Use Atomic Groups for optimising performance. A non-atomic expression \b(foobar|foot|foo)\b and a test string of foots will: match foo of foobar => fail and backtrack to the 2nd alter...
Submitted by anonymous - 9 years ago
1

hastags shortcuts

PCRE (PHP <7.3)
This regexp is used in the SPIP cms for create tags fastly when you are writting a post.
Submitted by pierre.laszczak@gmail.com - 9 years ago
0

detect if input is valid domain name

PCRE (PHP <7.3)
no description available
Submitted by nnnn20430 - 9 years ago
1

ConnectionStringServerDatabase

Python
Extract the server and database name from SQL Server connection string
Submitted by Davos - 9 years ago
1

Lines file First and Last Node

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
1

Java

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
1

pohe no nubmer valdiation

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
1

CR with no LF or PG at the end

PCRE (PHP <7.3)
Match lines with CR (Carriege Return) with no LF (Line Feed - New Line) or PG (Page Break) next to it.
Submitted by Hans Mauricio Burbano E - 9 years ago
1

Find label

Python
Find label in MIPS assembly
Submitted by Dlavoieb - 9 years ago
1

Non Capturing Group

PCRE (PHP <7.3)
It won't capture in the group.we can't back refrence A(?:nt|pple)\sA\1
Submitted by anonymous - 9 years ago
1...189190191192193...902

Community Library Entry

1

Regular Expression
PCRE (PHP <7.3)

/
(?<=than\s)better(?=\sabsolutely)
/
g
Open regex in editor

Description

Look ahead Positive(?=)

Find expression A where expression B follows

A(?=B)

Look behind Positive(?<=)

Find expression A where expression B precedes

(?<=B)A

Submitted by anonymous - 9 years ago