Regular Expressions 101

Pro

Positive Lookbehind(?<=\S)

\Sany non-whitespace character

\s{1,4}any whitespace character, repeated between 1 and 4 times

Positive Lookahead(?=\S)

\Sany non-whitespace character

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

(?<=\S)\s{1,4}(?=\S)

New

I need             only                <5                         white-spaces   removed

I need             only                <5                         white-spaces   removed