Regular Expressions 101

Pro

^start of line

PKGthe literal text PKG (case sensitive)

Character Class[a-z]?

?matches at most one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]{0,4}

{0,4}matches between 0 and 4 characters from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

\.{3}the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated exactly 3 times

BBthe literal text BB (case sensitive)

Character Class[A-B]

A-Bone character from A (65₁₀) to B (66₁₀) (case sensitive)

,the literal text ,

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of 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.

25 tokens

^PKG[a-z]?\.[0-9]{0,4} \.{3} BB[A-B] , *$

PKGx.1234 ... BBA ,