Regular Expressions 101

^start of line

Group 1(\d{4})

\d{4}a Unicode decimal digit, 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

^(\d{4})

New

1874[71]-88
1848, 50
[1820?]
1883
1864-72
1885, [1884]

1874[71]-88
1848, 50
[1820?]
1883
1864-72
1885, [1884]