Regular Expressions 101

this is the literal text this is (case sensitive)

Condition(?(?=t\w{3})true|false)

Uses the first branch if the lookaround matches

Positive Lookahead(?=t\w{3})

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

\w{3}any word character, repeated exactly 3 times

If the condition is true, match this branch:true

truethe literal text true (case sensitive)

Otherwise, match this branch:false

falsethe literal text false (case sensitive)

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

this is (?(?=t\w{3})true|false)

New

this is true
this is false
this is something else
is this true
is this false

this is true
this is false
this is something else
is this true
is this false