Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=(?:[^\d.\n]*[\d.]){2})

Non-Capturing Group(?:[^\d.\n]*[\d.]){2}

{2}repeats the group contents below exactly 2 times:

Negated Character Class[^\d.\n]*

*matches any number of characters outside the set below:

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\na line-feed (newline) character (ASCII 10)

Character Class[\d.]

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:[^\n*]*\*){1,2}

{1,2}repeats the group contents below between 1 and 2 times:

Negated Character Class[^\n*]*

*matches any number of characters outside the set below:

\na line-feed (newline) character (ASCII 10)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Negated Character Class[^\n*]*

*matches any number of characters outside the set below:

\na line-feed (newline) character (ASCII 10)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

$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

^(?=(?:[^\d.\n]*[\d.]){2})(?:[^\n*]*\*){1,2}[^\n*]*$

1*2
1**2
*2.*

ab*
1*
1*2*.*