Regular Expressions 101

Pro

Branch Reset Group(?|(\[)(?=\h*x\h*])|(?<=\[)\h*x\h*(]))

1st Alternative(\[)(?=\h*x\h*])

Group 1(\[)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Positive Lookahead(?=\h*x\h*])

\h*any horizontal whitespace character, repeated any number of times

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

\h*any horizontal whitespace character, repeated any number of times

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative(?<=\[)\h*x\h*(])

Positive Lookbehind(?<=\[)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\h*any horizontal whitespace character, repeated any number of times

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

\h*any horizontal whitespace character, repeated any number of times

Group 1(])

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

(?|(\[)(?=\h*x\h*])|(?<=\[)\h*x\h*(]))

New

Yes: [x]
Yes: [  x]
Yes: [x  ]
Yes: [  x  ]
No: [
No: ]

Yes: [x]
Yes: [  x]
Yes: [x  ]
Yes: [  x  ]
No: [
No: ]