Regular Expressions 101

Pro

^start of line

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Negative Lookahead(?!0|168\.0?[1-9]|169)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative168\.0?[1-9]

168the literal text 168

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

3rd Alternative169

169the literal text 169

Non-Capturing Group(?:\d?\d|1[0-6]\d)

1st Alternative\d?\d

\d?optionally matches a digit

\da digit

2nd Alternative1[0-6]\d

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-6]

0-6one character from 0 (48₁₀) to 6 (54₁₀)

\da digit

Non-Capturing Group(?:\.\d?\d)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d?optionally matches a digit

\da digit

Character Class[SN]?

?matches at most one character from the set below:

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

Nthe literal N (78₁₀ / 116₈ / 4E₁₆) (case sensitive)

$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

^ *(?!0|168\.0?[1-9]|169)(?:\d?\d|1[0-6]\d)(?:\.\d?\d)?[SN]?$

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