regex101: PCRE (Legacy) Match 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

keyword1 the literal text keyword1 (case sensitive)

.*?any character, repeated any number of times

Non-Capturing Group(?: (?: keyword1 | keyword2 ) (*SKIP) (*FAIL) | keyword3 )

1st Alternative (?: keyword1 | keyword2 ) (*SKIP) (*FAIL)

Non-Capturing Group(?: keyword1 | keyword2 )

1st Alternative keyword1

keyword1 the literal text keyword1 (case sensitive)

2nd Alternative keyword2

keyword2 the literal text keyword2 (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 keyword3

keyword3 the literal text keyword3 (case sensitive)

.*?any character, repeated any number of times

Non-Capturing Group(?: keyword1 (*SKIP) (*FAIL) | keyword2 )

1st Alternative keyword1 (*SKIP) (*FAIL)

keyword1 the literal text keyword1 (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 keyword2

keyword2 the literal text keyword2 (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)
     keyword1 .*? 
     (?:
          (?: keyword1 | keyword2 )
          (*SKIP) (*FAIL) 
       |  keyword3
     )
     .*? 
     (?: keyword1 (*SKIP) (*FAIL) | keyword2 )

New

List of keywords :

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

Example A:

keyword1 = <page>
text to consider without keyword-Not3
keyword2 = </page>

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

Example B:

keyword1 = <page>
text to consider with keyword3
keyword2 = </page>

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

Substitution

List of keywords :

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

Example A:

keyword1 = <page>
text to consider without keyword-Not3
keyword2 = </page>

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

Example B:

keyword1 = <page>
text to consider with keyword3
keyword2 = </page>

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