Regular Expressions 101

^start of line

Negated Character Class[^#+&'"\\\s]+

+matches at least one character outside the set below:

#the literal # (35₁₀ / 43₈ / 23₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\sany whitespace character

Non-Capturing Group(?:\s[^#+&'"\\\s]+)*

*repeats the group contents below any number of times:

\sany whitespace character

Negated Character Class[^#+&'"\\\s]+

+matches at least one character outside the set below:

#the literal # (35₁₀ / 43₈ / 23₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\sany whitespace character

$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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^[^#+&'"\\\s]+(?:\s[^#+&'"\\\s]+)*$

New


      ---> invalid
 
     ---> invalid
 a
    ---> invalid
a b
   ---> valid
a  b
  ---> invalid