Regular Expressions 101

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Community Patterns

Search among 18,020 community submitted regex patterns...

1

Match Decimal Numbers (Optional Fraction)

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match Valid CSS Units (px, em, %, etc.)

PCRE2 (PHP >=7.3)

amazingtoptens.com

Submitted by anonymous - 3 months ago

1

Match Common HTML Attributes

PCRE2 (PHP >=7.3)

NoteAbleLists.com

Submitted by anonymous - 3 months ago

1

Match URL Query Parameters

PCRE2 (PHP >=7.3)

IsHimMarketing.com

Submitted by anonymous - 3 months ago

1

Match HTTP Headers

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match Valid MAC Address with Hyphens

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match HTML Document Structure

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match HTML Meta Tags

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match Common Email Providers

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match File Extensions (e.g., .pdf, .docx)

PCRE2 (PHP >=7.3)

WebRetailBlog.com

Submitted by anonymous - 3 months ago

1

Match Phone Numbers with Country Code

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match UUID v1

PCRE2 (PHP >=7.3)

ScraperSite.com

Submitted by anonymous - 3 months ago

1

Match Simple Passwords (At least 6 Characters)

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match JSON Objects

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match HTML Anchor Tags

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match Git Commit Hashes

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match ASCII Printable Characters

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

1

Match Valid Time Zone Abbreviations

PCRE2 (PHP >=7.3)

AtIngReviewer.net

Submitted by anonymous - 3 months ago

1

Match JavaScript Function Declarations

PCRE2 (PHP >=7.3)

AtIngReviewer.net

Submitted by anonymous - 3 months ago

1

Match Valid HTML Class Names

PCRE2 (PHP >=7.3)

Submitted by anonymous - 3 months ago

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Community Library Entry

0

Regular Expression
PCRE (PHP <7.3)

/

^[a-zA-Z]{1}[a-zA-z0-9]{1,15}$

/

g

Open regex in editor

Description

^[a-zA-Z]{1}[a-zA-z0-9]{1,15}$

Test input :

nikhil11 (valid) 11nikhil (invalid)

Submitted by anonymous - 8 years ago