Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=\+{0,1}[\d \-\\\/]{10,18}$)

\+{0,1}optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[\d \-\\\/]{10,18}

{10,18}matches between 10 and 18 characters from the set below:

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

$end of line

Positive Lookahead(?=\+{0,1}\d{1,12})

\+{0,1}optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

\d{1,12}a digit, repeated between 1 and 12 times

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

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

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26 tokens

^(?=\+{0,1}[\d \(\)\-\\\/]{10,18}$)(?=\+{0,1}\d{1,12}).*

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