Regular Expressions 101

Pro

Positive Lookbehind(?<=H\d{3}\b)

Hthe literal H (72₁₀ / 110₈ / 48₁₆) (case sensitive)

\d{3}a digit, repeated exactly 3 times

\ban ASCII word boundary

Non-Capturing Group(?:(?!\+?H\d{3}\b|^End word\b)[\S\s])+

+repeats the group contents below at least once:

Negative Lookahead(?!\+?H\d{3}\b|^End word\b)

1st Alternative\+?H\d{3}\b

\+?optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

Hthe literal H (72₁₀ / 110₈ / 48₁₆) (case sensitive)

\d{3}a digit, repeated exactly 3 times

\ban ASCII word boundary

2nd Alternative^End word\b

^start of line

End wordthe literal text End word (case sensitive)

\ban ASCII word boundary

Character Class[\S\s]

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=[\s\S]*\r?\nEnd word\b)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

\r?optionally matches a carriage return (ASCII 13)

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

End wordthe literal text End word (case sensitive)

\ban ASCII word boundary

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

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25 tokens

(?<=H\d{3}\b)(?:(?!\+?H\d{3}\b|^End word\b)[\S\s])+(?=[\s\S]*\r?\nEnd word\b)

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