Regular Expressions 101

Negative Lookahead(?!^)

^start of string

Negative Lookbehind(?<!\d[.A-Z])

\da digit

Character Class[.A-Z]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Negative Lookbehind(?<!\d[A-Z]\.)

\da digit

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ban ASCII word boundary

Positive Lookahead(?=\d+(?:[a-zA-Z]|\.)\s+\p{Lu})

\d+a digit, repeated at least once

Non-Capturing Group(?:[a-zA-Z]|\.)

1st Alternative[a-zA-Z]

Character Class[a-zA-Z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s+any whitespace character, repeated at least once

\p{Lu}an uppercase letter

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?!^)(?<!\d[.A-Z])(?<!\d[A-Z]\.)\b(?=\d+(?:[a-zA-Z]|\.)\s+\p{Lu})

New

5. SCOPE This document outlines what to do in case of emergency landing (ignore for non-emergency landings) on tarmac. 6. WHEELS Never land on tarmac. Unless you have lowered the plane wheel mechanism. 6.1 Lower the wheel mechanism using the 2 Switches labelled 'wheel mechanism'. 7A WARNING 7A.1 Do not forget to warn passengers.

Substitution

\n-----------\n