Regular Expressions 101

Explanation

Pro

Group base(?<base>.+?)

.+?any character (except for line terminators), repeated at least once

Group 2($(?<idx>\d+)$?)?

?repeats the group contents below at most once:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group idx(?<idx>\d+)

\d+a digit, repeated at least once

\)?optionally matches the literal ) (41₁₀ / 51₈ / 29₁₆)

Group ext(?<ext>(\.[\w\.]+))

Group 5(\.[\w\.]+)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w\.]+

+matches at least one character from the set below:

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

(?<base>.+?)(\((?<idx>\d+)\)?)?(?<ext>(\.[\w\.]+))

New

somefile.docx   
somefile
somefile (6)
somefile (1).docx
somefile (2)(1).docx
somefile (4).htm.tmpl

somefile.docx   
somefile
somefile (6)
somefile (1).docx
somefile (2)(1).docx
somefile (4).htm.tmpl