Regular Expressions 101

Community Patterns

4

import url image

Python
import url image
Submitted by bartimeys - 8 years ago
4

CloudFlare

PCRE2 (PHP >=7.3)
Cloud Flare
Submitted by anonymous - 2 years ago
4

Email

PCRE2 (PHP >=7.3)
email format control
Submitted by ahmetbarut - 2 years ago

DNS hostname well-formedness validation

4

Regular Expression
PCRE (PHP <7.3)

/
^(?:_?(?>[a-z\d][a-z\d-]{0,61}[a-z\d]|[a-z\d])\.)*(?:_?(?>[a-z\d][a-z\d-]{0,61}[a-z\d]|[a-z\d]))\.?$
/
i

Description

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Submitted by Jeff Walter - 8 years ago