Regular Expressions 101

Pro

^start of line

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1(\d{5}|\d{2}(?=\d*\.\d*)[\d.]{3}\d)

1st Alternative\d{5}

\d{5}a digit, repeated exactly 5 times

2nd Alternative\d{2}(?=\d*\.\d*)[\d.]{3}\d

\d{2}a digit, repeated exactly 2 times

Positive Lookahead(?=\d*\.\d*)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

Character Class[\d.]{3}

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

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

$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.

26 tokens

^-?(\d{5}|\d{2}(?=\d*\.\d*)[\d.]{3}\d)$

New