regex101: PCRE (Legacy) Substitution Workspace

Non-Capturing Group(?:<ins class="thisisfirstscript")

<ins class="thisisfirstscript"the literal text <ins class="thisisfirstscript" (case sensitive)

Group 1([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Non-Capturing Group(?:data-slot="4397140188"><\/ins>)

data-slot="4397140188"><the literal text data-slot="4397140188">< (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

ins>the literal text ins> (case sensitive)

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

Search reference

Regular Expression

(?:<ins class="thisisfirstscript")([\s\S]*?)(?:data-slot="4397140188"><\/ins>)

New

<ins class="thisisfirstscript"
         style="display:inline-block;width:336px;height:280px"
         data-client="ABCD"
         data-slot="4397140188"></ins>

    <ins class="thisissecondscript"
         style="display:inline-block;width:336px;height:280px"
         data-client="CDEF"
         data-slot="4496122889"></ins>

<ins class="thisisfirstscript"
         style="display:inline-block;width:336px;height:280px"
         data-client="ABCD"
         data-slot="4397140188"></ins>

Substitution

$1index.php