Regular Expressions 101

Non-Capturing Group(?:(?=[^<>]*)|\G(?!^))

1st Alternative(?=[^<>]*)

the literal text (case sensitive)

Positive Lookahead(?=[^<>]*)

Negated Character Class[^<>]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

the literal text (case sensitive)

2nd Alternative\G(?!^)

\Gstart of current search

Negative Lookahead(?!^)

^start of line

Negated Character Class[^\d<>]*

*matches any number of characters outside the set below:

\da digit

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\d+a digit, repeated at least once

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

\hany horizontal whitespace character

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:<p>(?=[^<>]*</p>)|\G(?!^))[^\d<>]*\d+\K\h

<p>My 90 days 123 work.</p>