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

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25 tokens

Regular Expression

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

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