Regular Expressions 101

Pro

\ban ASCII word boundary

Non-Capturing Group(?:(?!of|a)[a-zA-Z]+ +)?

?repeats the group contents below at most once:

Negative Lookahead(?!of|a)

1st Alternativeof

ofthe literal text of (case sensitive)

2nd Alternativea

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

\ban ASCII word boundary

Positive Lookahead(?= +(?:building|mansion|plaza)\b)

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Non-Capturing Group(?:building|mansion|plaza)

1st Alternativebuilding

buildingthe literal text building (case sensitive)

2nd Alternativemansion

mansionthe literal text mansion (case sensitive)

3rd Alternativeplaza

plazathe literal text plaza (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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

\b(?:(?!of|a)[a-zA-Z]+ +)?[a-zA-Z]+\b(?= +(?:building|mansion|plaza)\b)

New

big fake plaza, 12 this street,district, city
Green mansion, district, city
Block 7 of orange building  district, city
98 main street block a blue plaza, city
blue red mansion, 46 pearl street, city