Regular Expressions 101

Group ins_all(?<ins_all> # insertion can be multilines (?<!\\)\+{2} # Start with 2 + (?!\n) # but not followed by a new line to avoid any previous + getting caught (?<ins_content> # the content which excludes any + unless they are escaped (?>\\[\+]|[^\+])*+ ) (?<!\\)\+{2} # terminated by 2 + )

Comment: insertion can be multilines

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\+{2}the literal + (43₁₀ / 53₈ / 2B₁₆) , repeated exactly 2 times

Comment: Start with 2 +

Negative Lookahead(?!\n)

\na line-feed (newline) character (ASCII 10)

Comment: but not followed by a new line to avoid any previous + getting caught

Group ins_content(?<ins_content> # the content which excludes any + unless they are escaped (?>\\[\+]|[^\+])*+ )

Comment: the content which excludes any + unless they are escaped

Atomic Group(?>\\[\+]|[^\+])*+

*+repeats the group contents below any number of times:

1st Alternative\\[\+]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Character Class[\+]

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

2nd Alternative[^\+]

Negated Character Class[^\+]

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\+{2}the literal + (43₁₀ / 53₈ / 2B₁₆) , repeated exactly 2 times

Comment: terminated by 2 +

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

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

No unit tests · Add a test to get started

25 tokens

Regular Expression

(?<ins_all>                     # insertion can be multilines
    (?<!\\)\+{2}                # Start with 2 +
    (?!\n)                      # but not followed by a new line to avoid any previous + getting caught
    (?<ins_content>             # the content which excludes any + unless they are escaped
        (?>\\[\+]|[^\+])*+
    )
    (?<!\\)\+{2}                # terminated by 2 +
)

Unit Tests

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