Regular Expressions 101

\ban ASCII word boundary

datthe literal text dat (case insensitive)

\w*any word character, repeated any number of times

\s*any whitespace character, repeated any number of times

wythe literal text wy (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1(\d{4}([-/ .])\d{2}\2\d{2}|\d{2}([-/ .])\d{2}\3\d{4})

1st Alternative\d{4}([-/ .])\d{2}\2\d{2}

\d{4}a digit, repeated exactly 4 times

Group 2([-/ .])

Character Class[-/ .]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{2}a digit, repeated exactly 2 times

\2the text saved by group 2

\d{2}a digit, repeated exactly 2 times

2nd Alternative\d{2}([-/ .])\d{2}\3\d{4}

\d{2}a digit, repeated exactly 2 times

Group 3([-/ .])

Character Class[-/ .]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{2}a digit, repeated exactly 2 times

\3the text saved by group 3

\d{4}a 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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\bdat\w*\s*wy\.?(\d{4}([-/ .])\d{2}\2\d{2}|\d{2}([-/ .])\d{2}\3\d{4})

New

abc18.Dat   wy.03/12/2019FFF*Dato dost2009/03/03**data wy2020-09-30