Regular Expressions 101

Non-Capturing Group(?::keyword_start:|\G(?!^)\S+)

1st Alternative:keyword_start:

:keyword_start:the literal text :keyword_start: (case sensitive)

2nd Alternative\G(?!^)\S+

\Gstart of current search

Negative Lookahead(?!^)

^start of string

\S+any non-whitespace character, repeated at least once

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Negative Lookbehind(?<!_end:)

_end:the literal text _end: (case sensitive)

\s+any whitespace character, repeated at least once

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?::keyword_start:|\G(?!^)\S+)\K(?<!_end:)\s+

New

This is a teststring ... :keyword_start: this is    the content    with double spaces :keyword_end: more text ... :keyword_start: this is the second   content    with double spaces :keyword_end: ... more tex

Regular Expression

Extraction