Regular Expressions 101

Negative Lookbehind(?<!\S)

\Sany character that is not Unicode whitespace

Non-Capturing Group(?:(?!\b(?:at|on|in|adjoining)\b)[^\n\d])*?

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

Negative Lookahead(?!\b(?:at|on|in|adjoining)\b)

\ba Unicode word boundary

Non-Capturing Group(?:at|on|in|adjoining)

1st Alternativeat

atthe literal text at (case sensitive)

2nd Alternativeon

onthe literal text on (case sensitive)

3rd Alternativein

inthe literal text in (case sensitive)

4th Alternativeadjoining

adjoiningthe literal text adjoining (case sensitive)

\ba Unicode word boundary

Negated Character Class[^\n\d]

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

\da Unicode decimal digit

streetthe literal text street (case sensitive)

\ba Unicode 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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?<!\S)(?:(?!\b(?:at|on|in|adjoining)\b)[^\n\d])*? street\b

New

flat 14, 24-34 barrington street, London
23 the honourable lord barrington's street, London
23 the honourable lord barrington's street, 42 the dishonarable baron lordington's street, London
land to the south of barrington street, London
plot 12 on barrington street, London