regex101: PCRE2 (PHP) Substitution Workspace

^start of line

Positive Lookahead(?=(?:\w*\W){12}(\w)(\D).{4}(.)\S\s(.)(\D))

Non-Capturing Group(?:\w*\W){12}

{12}repeats the group contents below exactly 12 times:

\w*any word character, repeated any number of times

\Wany non-word character

Group 1(\w)

\wany word character

Group 2(\D)

\Dany character that's not a digit

.{4}any character (except for line terminators), repeated exactly 4 times

Group 3(.)

.any character (except for line terminators)

\Sany non-whitespace character

\sany whitespace character

Group 4(.)

.any character (except for line terminators)

Group 5(\D)

\Dany character that's not a digit

Negated Character Class[^a]+

+matches at least one character outside the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

Group 6(.)

.any character (except for line terminators)

Positive Lookahead(?=.*?(?![^p])(.)\w*(\w))

.*?any character (except for line terminators), repeated any number of times

Negative Lookahead(?![^p])

Negated Character Class[^p]

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case sensitive)

Group 7(.)

.any character (except for line terminators)

\w*any word character, repeated any number of times

Group 8(\w)

\wany word character

Negated Character Class[^i]*

*matches any number of characters outside the set below:

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

Group 9([^\W] )

Negated Character Class[^\W]

\Wany non-word character

\s+any whitespace character, repeated at least once

.any character (except for line terminators)

\sany whitespace character

Character Class[rf]+

+matches at least one character from the set below:

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

Group 10([^0-9])

Negated Character Class[^0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

.any character (except for line terminators)

\ban ASCII word boundary

.any character (except for line terminators)

.?optionally matches any character (except for line terminators)

Group 11(\D)

\Dany character that's not a digit

\w*any word character, repeated any number of times

\Wany non-word character

Group 12(\w)

\wany word character

.any character (except for line terminators)

Group 13(.)

.any character (except for line terminators)

Group 14([\S\s])

Character Class[\S\s]

\Sany non-whitespace character

\sany whitespace character

Negated Character Class[^.]+

Group 15(\W)

Character Class[\S\s]*

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

Positive Lookahead(?=\s(\S))

Character Class[\s\S]++

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Search reference

Regular Expression

^(?=(?:\w*\W){12}(\w)(\D).{4}(.)\S\s(.)(\D))
[^a]+(.)(?=.*?(?![^p])(.)\w*(\w))[^i]*([^\W]
)\s+..\s[rf]+([^0-9]).\b..?(\D)\w*\W(\w).(.)
([\S\s])[^.]+(\W)[\S\s]*\|(?=\s(\S))[\s\S]++

Test String
New

We did not inherit this earth from our parents, we have borrowed it from our children.

              /-
            .-|=====-.
            | @      |
         ___|________|
                ||
         <_>  \ ||   \|/ \_/
         \|/  \\||  \\|   |//
       __\|//_\\|///_\V/_\|//__

Substitution
Processing...

$1$2$1$1${14}$3${15}$1${11}$1$1${14}$3${16}$3${12}${14}${13}$7${8}$2${15}$6$5

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...