Regular Expressions 101

Explanation
Pro

^start of line

Character Class[a-zA-Z]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[0-9]{3}

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

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

$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.

25 tokens

^[a-zA-Z][0-9]{3}$

New

A123
B33344
C444
DXYZ
e12E
Fx85
g345
_334
%887
#888
z88944
y888
A 999

A123
B33344
C444
DXYZ
e12E
Fx85
g345
_334
%887
#888
z88944
y888
A 999