Regular Expressions 101

Pro

^start of line

Group 1((?:(?:(?<!^)[ ])?[^*&@_#$\]\\\^\d ]+){1,3})

Non-Capturing Group(?:(?:(?<!^)[ ])?[^*&@_#$\]\\\^\d ]+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

Non-Capturing Group(?:(?<!^)[ ])?

?repeats the group contents below at most once:

Negative Lookbehind(?<!^)

^start of line

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

Negated Character Class[^*&@_#$\]\\\^\d ]+

+matches at least one character outside the set below:

*the literal * (42₁₀ / 52₈ / 2A₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

\da Unicode decimal digit

the literal (32₁₀ / 40₈ / 20₁₆)

$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

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

25 tokens

^((?:(?:(?<!^)[ ])?[^*&@_#$\]\\\^\d ]+){1,3})$

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Uwe
Uwe-Jens
GÃ¼nther Kalle
Kalle Jens Chantal