Regular Expressions 101

Pro

^start of line

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[A-Z]+

+matches at least one character from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

Regular Expression

^0?[1-9][0-9]*_[A-Z]+-[0-9]{3}$

New

ABC_DE-001
 is invalid 
abc
 is invalid (only alphabets) 0_DE-001
 is invalid (1 zero before underscore) 
000_DE-001
 is invalid (sequence of 3 consecutive zeroes) 
00_DE-001
 is invalid (sequence of 2 consecutive zeroes) 
01_DE-001
 is valid (0 followed by some other number is valid) 
10_DE-001
 is valid (starts with 1) 
100_DE-001
 is valid (starts with 1