Regular Expressions 101

Pro

Positive Lookbehind(?<=\w{4})

\w{4}any word character, repeated exactly 4 times

\h+any horizontal whitespace character, repeated at least once

Positive Lookahead(?=\w{4})

\w{4}any word character, repeated exactly 4 times

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

(?<=\w{4})\h+(?=\w{4})

New

check24  smavey  dr klein
smava
check24, interhyp
verivox  check24  dr. klein
dr. klein
NA
dr. weber
dr. klein,
NA
check24
check24  verivox

Name1, Name2 Name3
Dr. Name1 Name2 Name3
AAA AAAA AAAA AAAA

Substitution

_

check24  smavey  dr klein
smava
check24, interhyp
verivox  check24  dr. klein
dr. klein
NA
dr. weber
dr. klein,
NA
check24
check24  verivox

Name1, Name2 Name3
Dr. Name1 Name2 Name3
AAA AAAA AAAA AAAA