Regular Expressions 101

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?! )

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1((?:ftp|http)[^ ]+)?

?repeats the group contents below at most once:

Non-Capturing Group(?:ftp|http)

1st Alternativeftp

ftpthe literal text ftp (case sensitive)

2nd Alternativehttp

httpthe literal text http (case sensitive)

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

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

\.(?! )((?:ftp|http)[^ ]+)?

New

See also vadding.Constructions on this term abound.http://example.com/foo/bar some text here. and some texts here

. $1