regex101: PCRE (Legacy) Substitution Workspace

Pro

(?s)applies the following effective flags to the remainder of the pattern: gxs

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

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

Group 1( .*? (?: (?: <page> | </page> ) (*SKIP) (*FAIL) | {{Infobox ) .*? )

.*?any character, repeated any number of times

Non-Capturing Group(?: (?: <page> | </page> ) (*SKIP) (*FAIL) | {{Infobox )

1st Alternative (?: <page> | </page> ) (*SKIP) (*FAIL)

Non-Capturing Group(?: <page> | </page> )

1st Alternative <page>

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

2nd Alternative </page>

</page> the literal text </page> (case sensitive)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternative {{Infobox

{{Infobox the literal text {{Infobox (case sensitive)

.*?any character, repeated any number of times

Non-Capturing Group(?: <page> (*SKIP) (*FAIL) | </page> )

1st Alternative <page> (*SKIP) (*FAIL)

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

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternative </page>

</page> the literal text </page> (case sensitive)

Global pattern flags

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

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

25 tokens

Regular Expression

     (?s)
     <page>
     (                          
          .*? 
          (?:
               (?: <page> | </page> )
               (*SKIP) (*FAIL) 
            |  {{Infobox
          )
          .*? 
     )                           
     (?: <page> (*SKIP) (*FAIL) | </page> )

New

List of keywords :

keyword1 = <page>
keyword2 = </page>
keyword3 = {{Infobox

Example A:

<page>
text to consider without {{ not-Infobox
</page>


Result => do not extract (or keep or split) this part.

Example B:

<page>
text to consider with {{Infobox here}}
</page>

Result => extract (or keep or split) this part.

Extraction

List of keywords :

keyword1 = <page>
keyword2 = </page>
keyword3 = {{Infobox

Example A:

<page>
text to consider without {{ not-Infobox
</page>


Result => do not extract (or keep or split) this part.

Example B:

<page>
text to consider with {{Infobox here}}
</page>

Result => extract (or keep or split) this part.