Regular Expressions 101

Negative Lookbehind(?<!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\ban ASCII word boundary

Character Class[1-9]

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

\d*a digit, repeated any number of times

\s+any whitespace character, repeated at least once

Group 1(left|remaining)

1st Alternativeleft

leftthe literal text left (case sensitive)

2nd Alternativeremaining

remainingthe literal text remaining (case sensitive)

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

(?<!-)\b[1-9]\d*\s+(left|remaining)

New

0 left
1 left
2 left
3 left
0 remaining
1 remaining
2 remaining
you have 3 left
(13 left)
there are 12 remaining today
You have (-12 left) today
There are (3 left)
-15 remaining today
you have -24 left today

Substitution

0 left
1 left
2 left
3 left
0 remaining
1 remaining
2 remaining
you have 3 left
(13 left)
there are 12 remaining today
You have (-12 left) today
There are (3 left)
-15 remaining today
you have -24 left today