Regular Expressions 101

Positive Lookahead(?=<heading>.*?<\/heading>)

<heading>the literal text <heading> (case sensitive)

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

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

heading>the literal text heading> (case sensitive)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=<heading>.*?<\/heading>)

<heading>فهرست اول</heading>hi my name is mahdi  whats app <heading>فهرست دوم</heading>how are you