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What regex can I use to validate a number between 0 and 255?

php regex validation pcre

regex (in PHP) to match & that aren't HTML entities

php regex pcre

Compilation failed: POSIX collating elements are not supported

php regex posix preg-match pcre

How to handle PCRE with Unicode?

Negative lookbehind assertion regex has unexpected result with grep -P

regex linux grep pcre

Capture with negative look behind

php regex pcre

Which characters exactly match \s in PHP's PCREs?

php pcre

What is the correct syntax for a Regex find-and-replace using REGEXP_REPLACE in MariaDB?

mysql regex pcre mariadb

Regex to use each letter only once?

regex pcre

PCRE regular expressions using named pattern subroutines

php regex pcre

Replacing multiple (only inner) spaces with a single one in PHP?

php regex preg-replace pcre

What does \x in PHP PCRE mean?

php regex pcre

Why implement a different regex engine (e.g. PCRE) as a pragma?

regex perl pcre re2

PCRE: ^|$ and \A|\Z?

php regex preg-match pcre

Why do these three regexes have different step counts?

regex pcre

Converting PCRE recursive regex pattern to .NET balancing groups definition

Should we consider using range [a-z] as a bug?

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