Regular Expressions 101

^start of line

Non-Capturing Group(?:(?:\+|00)33|0)

1st Alternative(?:\+|00)33

Non-Capturing Group(?:\+|00)

1st Alternative\+

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

2nd Alternative00

00the literal text 00

33the literal text 33

2nd Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Comment: Dialing code

\s*any whitespace character, repeated any number of times

Character Class[1-9]

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

Comment: First number (from 1 to 9)

Non-Capturing Group(?:[\s.-]*\d{2}){4}

{4}repeats the group contents below exactly 4 times:

Character Class[\s.-]*

*matches any number of characters from the set below:

\sany whitespace character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

Comment: End of the phone number

$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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

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Search reference

Regular Expression

^
    (?:(?:\+|00)33|0)     # Dialing code
    \s*[1-9]              # First number (from 1 to 9)
    (?:[\s.-]*\d{2}){4}   # End of the phone number
$

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