Regular Expressions 101

Positive Lookbehind(?<=<\/h\d+>\s*)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

\d+a digit, repeated at least once

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\s*any whitespace character, repeated any number of times

\Sany non-whitespace character

.*?any character, repeated any number of times

Positive Lookahead(?=\s*<h\d|$)

1st Alternative\s*<h\d

\s*any whitespace character, repeated any number of times

<hthe literal text <h (case sensitive)

\da digit

2nd Alternative$

$end of string

Global pattern flags

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

s modifier: single line. Allows a dot to match line terminators

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Search reference

Regular Expression

(?<=<\/h\d+>\s*)\S.*?(?=\s*<h\d|$)

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