Regular Expressions 101

Pro

^start of line

Group value(?<value>.*?)

.*?any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\s+(?:-\s+)?E[1-3].*)?

?repeats the group contents below at most once:

\s+any whitespace character, repeated at least once

Non-Capturing Group(?:-\s+)?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\s+any whitespace character, repeated at least once

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

Character Class[1-3]

1-3one character from 1 (49₁₀) to 3 (51₁₀)

.*any character (except for line terminators), repeated any number of times

$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

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25 tokens

^(?<value>.*?)(?:\s+(?:-\s+)?E[1-3].*)?$

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