Regular Expressions 101

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Library entries

-22
python

1

no description available
Submitted by anonymous - 8 years ago
-12
python

Easy Email detection

Easy Email Detection
Submitted by Philip Lawall - 8 years ago
-11
python

54

no description available
Submitted by anonymous - 9 years ago
-3
python

Just IP

ip address
Submitted by whoyas2 - 8 years ago
-3
python

IPv4 address

Matches any IPv4 address
Submitted by anonymous - 6 years ago
-2
python

example

match
Submitted by anonymous - 8 years ago
-2
python

eee

no description available
Submitted by anonymous - 8 years ago
-2
python

link

no description available
Submitted by NTP-[SADAS] - 8 years ago
-2
python

five word capture

no description available
Submitted by anonymous - 8 years ago
-2
python

python bracketed text

why doesn't this match text in brackets?
Submitted by anonymous - 8 years ago
-2
python

Host and domains

no description available
Submitted by anonymous - 7 years ago
-2
python

IPv4

allows for all legal IPv4 addresses
Submitted by anonymous - 7 years ago
-2
python

twitter usernames

no description available
Submitted by anonymous - 7 years ago

match valid JSON

Vote

26

Regular Expression
pcre

/
(?(DEFINE) # Note that everything is atomic, JSON does not need backtracking if it's valid # and this prevents catastrophic backtracking (?<json>(?>\s*(?&object)\s*|\s*(?&array)\s*)) (?<object>(?>\{\s*(?>(?&pair)(?>\s*,\s*(?&pair))*)?\s*\})) (?<pair>(?>(?&STRING)\s*:\s*(?&value))) (?<array>(?>\[\s*(?>(?&value)(?>\s*,\s*(?&value))*)?\s*\])) (?<value>(?>true|false|null|(?&STRING)|(?&NUMBER)|(?&object)|(?&array))) (?<STRING>(?>"(?>\\(?>["\\\/bfnrt]|u[a-fA-F0-9]{4})|[^"\\\0-\x1F\x7F]+)*")) (?<NUMBER>(?>-?(?>0|[1-9][0-9]*)(?>\.[0-9]+)?(?>[eE][+-]?[0-9]+)?)) ) \A(?&json)\z
/
x

Description

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Submitted by Mateon1 - 8 years ago