Regular Expressions 101

^start of line

Positive Lookahead(?=.*[A-Z])

.*any character (except for line terminators), repeated any number of times

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Negative Lookahead(?!.*_)

.*any character (except for line terminators), repeated any number of times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.+any character (except for line terminators), repeated at least once

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

^(?=.*[A-Z])(?!.*_).+

New

FALSE:
example-chocolate-easter-egg-170g_349-85428671-ACCESSIBLEEASTEREGG
chocolate-easter-egg-170g349-85428671-accessibleeasteregg

TRUE:
example-chocolate-easter-egg-170g349-85428671-ACCESSIBLEEASTEREGG

Extraction

FALSE:
example-chocolate-easter-egg-170g_349-85428671-ACCESSIBLEEASTEREGG
chocolate-easter-egg-170g349-85428671-accessibleeasteregg

TRUE:
example-chocolate-easter-egg-170g349-85428671-ACCESSIBLEEASTEREGG