Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=[ \/]*[a-z0-9])

Character Class[ \/]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[a-z0-9]

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

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

Character Class[a-z0-9\/ ]{1,20}

{1,20}matches between 1 and 20 characters from the set below:

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

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

$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.

27 tokens

^(?=[ \/]*[a-z0-9])[a-z0-9\/ ]{1,20}$

New

asdas//A9898AAA
abcde / asbas
avcdesc
AVASD/ASDB
  ///aaa
aaaa /   
  //aa  aa
 /aaa     aaa///

asdas//A9898AAA
abcde / asbas
avcdesc
AVASD/ASDB
  ///aaa
aaaa /   
  //aa  aa
 /aaa     aaa///