Regular Expressions 101

Explanation

Pro

(?i)applies the following effective flags to the remainder of the pattern: gi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Non-Capturing Group(?:(?<=\d)(?=[a-z])|(?<=[a-z])(?=\d))

1st Alternative(?<=\d)(?=[a-z])

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

Positive Lookahead(?=[a-z])

Character Class[a-z]

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

2nd Alternative(?<=[a-z])(?=\d)

Positive Lookbehind(?<=[a-z])

Character Class[a-z]

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

Positive Lookahead(?=\d)

\da Unicode decimal digit

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

(?i)(?:(?<=\d)(?=[a-z])|(?<=[a-z])(?=\d))

subject101
     street45

subject101
     street45