Regular Expressions 101

Negative Lookbehind(?<![\da-z])

Character Class[\da-z]

\da Unicode decimal digit

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

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

1st Alternative([a-z]+)(\d+)

Group 1([a-z]+)

Character Class[a-z]+

+matches at least one character from the set below:

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

Group 2(\d+)

\d+a Unicode decimal digit, repeated at least once

2nd Alternative(\d+)([a-z]+)

Group 3(\d+)

\d+a Unicode decimal digit, repeated at least once

Group 4([a-z]+)

Character Class[a-z]+

+matches at least one character from the set below:

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

Negative Lookahead(?![\da-z])

Character Class[\da-z]

\da Unicode decimal digit

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

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

(?<![\da-z])(?:([a-z]+)(\d+)|(\d+)([a-z]+))(?![\da-z])

New

abc21" or "943xyz

 "a12bc", 

 "11a12bc",