Regular Expressions 101

Explanation

Pro

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

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

Non-Capturing Group(?:(?P<pre1994>[a-hj-np-z][\d]{1,7})|(?P<from1995to2014>[a-z]{3}[\d]{3})|(?P<from2015>[a-z]{2}[\d]{3}[a-z]{2}))

1st Alternative(?P<pre1994>[a-hj-np-z][\d]{1,7})

Group pre1994(?P<pre1994>[a-hj-np-z][\d]{1,7})

Character Class[a-hj-np-z]

a-hone character from a (97₁₀) to h (104₁₀) (case insensitive)

j-none character from j (106₁₀) to n (110₁₀) (case insensitive)

p-zone character from p (112₁₀) to z (122₁₀) (case insensitive)

Character Class[\d]{1,7}

{1,7}matches between 1 and 7 characters from the set below:

\da Unicode decimal digit

2nd Alternative(?P<from1995to2014>[a-z]{3}[\d]{3})

Group from1995to2014(?P<from1995to2014>[a-z]{3}[\d]{3})

Character Class[a-z]{3}

{3}matches exactly 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Character Class[\d]{3}

{3}matches exactly 3 characters from the set below:

\da Unicode decimal digit

3rd Alternative(?P<from2015>[a-z]{2}[\d]{3}[a-z]{2})

Group from2015(?P<from2015>[a-z]{2}[\d]{3}[a-z]{2})

Character Class[a-z]{2}

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Character Class[\d]{3}

{3}matches exactly 3 characters from the set below:

\da Unicode decimal digit

Character Class[a-z]{2}

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

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

(?i)(?:(?P<pre1994>[a-hj-np-z][\d]{1,7})|(?P<from1995to2014>[a-z]{3}[\d]{3})|(?P<from2015>[a-z]{2}[\d]{3}[a-z]{2}))

C1000000
FZI454
AB123CD

C1000000
FZI454
AB123CD