Regular Expressions 101

^start of line

(?i)applies the following effective flags to the remainder of the pattern: gmi

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

Character Class[T]

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case insensitive)

20the literal text 20

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

.any character (except for line terminators)

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

$end of line

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

^(?i)[T]20[0-9]{2}[0-1][0-9][0-3][0-9].\d{4}$

New

t20160307.0001
T20160201.0003
y20160202.0001
T20163022.11157
t2016o302.0001
T21160302.0001