Regular Expressions 101

Positive Lookbehind(?<=C[0-9]\.)

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:test\.trd\.co|trd\.co)

1st Alternativetest\.trd\.co

testthe literal text test (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

trdthe literal text trd (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

cothe literal text co (case sensitive)

2nd Alternativetrd\.co

trdthe literal text trd (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

cothe literal text co (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.

Search reference

Regular Expression

(?<=C[0-9]\.)(?:test\.trd\.co|trd\.co)

New

"C0.test.trd.co"
"C1.trd.co"
"C2.test.trd.co"

prod.trd.co