Regular Expressions 101

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Community Patterns

29

CSV line parsing

PCRE (PHP <7.3)
Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.
Submitted by Various - 10 years ago
35

IP Address validator

ECMAScript (JavaScript)
Validates IPv4 IP Address
Submitted by krzysp - 9 years ago
31

ninite

PCRE (PHP <7.3)
no description available
Submitted by peek - 9 years ago
13

URL Validator

PCRE (PHP <7.3)
Validates - URLs with schemes - http, https and ftp Relative URL starting with / and ../
Submitted by anonymous - 10 years ago
16

http url regex

ECMAScript (JavaScript)
general purpose HTTP URL regex
Submitted by Miguel Castillo @manchagnu - 9 years ago
29

Wrap long string to spec length

PCRE (PHP <7.3)
no description available
Submitted by fullpipe - 11 years ago
25

Quote Macthing with escape

ECMAScript (JavaScript)
Matches text within quotes (", ') and escapes the charecters.
Submitted by Vihan Bhargava - 10 years ago
9

Youtube ID match

PCRE (PHP <7.3)
This regex will match any Youtube video ID thrown at it and return one capturing group containing the ID.
Submitted by Jacob Overgaard - 11 years ago
3

Match quoted strings, ignoring escaped quotes

PCRE (PHP <7.3)
Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.
Submitted by Maddingue - 11 years ago
22

UK Postcode Checker

PCRE (PHP <7.3)
Checks for valid UK/British postcodes. There was another on here that had for some reason been upvoted, but it was actually incorrect as it worked on none of my valid own postcodes! Namely that it assumed two letters and a number (BS3) when you can have variations (M20). Allows for an optional spac...
Submitted by MaffooBristol - 10 years ago
13

regex101.com id grabber

PCRE (PHP <7.3)
grabs the ID for the regex101.com permalink to code
Submitted by chris mccoy - 10 years ago
7

Date validation

ECMAScript (JavaScript)
Besides leap year handling, this takes care of date validation in the yy-mm-dd format.
Submitted by anonymous - 9 years ago
11

Date(Including Leap Year) YYYY-MM-DD hh:mm:ss

PCRE (PHP <7.3)
Validates DateTime of format YYYY-MM-DD hh:mm:ss including Leap Year
Submitted by Madhan - 11 years ago
0

URL matching

PCRE (PHP <7.3)
Complete url matching with storage of various parameters
Submitted by hjpotter92 - 10 years 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)
1

Validate alphanumeric and numeric range

PCRE (PHP <7.3)
For Validating alphanumeric and numeric range
Submitted by anonymous - 10 years ago
25

grab valid css rules and properties

ECMAScript (JavaScript)
no description available
Submitted by Pavel Dominguez - 9 years ago
19

Between tags content

PCRE (PHP <7.3)
no description available
Submitted by Agustín Bouillet - 9 years ago
13

PHP variable name

PCRE (PHP <7.3)
Valid PHP variable name as defined in the manual at http://php.net/manual/en/language.variables.basics.php
Submitted by Erin Millard - 12 years ago
9

only numbers

PCRE (PHP <7.3)
A string with only numbers in
Submitted by Gotts - 9 years ago
1234...901

Community Library Entry

1

Regular Expression
Rust

r"
^(?P<metric>[a-zA-Z_:][a-zA-Z0-9_:]*]*)(?P<labels>\{.*\})?[\t ]*(?P<value>[0-9E.]*)[\t ]*(?P<timestamp>[0-9]+)?$
"
gm
Open regex in editor

Description

Prometheus exposition metric line format. Parses metric lines with named capture groups for metric name, labels, value, and timestamp. Excludes comment, type, and help lines.

https://prometheus.io/docs/instrumenting/exposition_formats/#line-format

Submitted by james-jra - a year ago