Regular Expressions 101

Non-Capturing Group(?:\b|\W)?

?repeats the group contents below at most once:

1st Alternative\b

\ban ASCII word boundary

2nd Alternative\W

\Wany non-word character

Group year(?<year>2(?:0|1)\d\d)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:0|1)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

\ban ASCII word boundary

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.

Search reference

Regular Expression

(?:\b|\W)?(?<year>2(?:0|1)\d\d)\b

New

  '2025',
  '2150 is the year to match',
  'the year is 2030 see ref 2099662',
  'Should match the year here YEAR_2140 even though it has non numric chars preceeding it',
  'Should match the year at the end of a string like this - 2140',
  'ref 2099662 the year is 2140. And there is another sentence',
  'ref 2099662 the end of the string is the year 2140',
  'There is no year here 2055667'

Regular Expression

Substitution