Regular Expressions 101

Positive Lookbehind(?<=^|(?<=[^.?\/[:alnum:]]))

1st Alternative^

^start of string

2nd Alternative(?<=[^.?\/[:alnum:]])

Positive Lookbehind(?<=[^.?\/[:alnum:]])

Negated Character Class[^.?\/[:alnum:]]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

[:alnum:]an alphanumeric character [a-zA-Z0-9]

#+the literal # (35₁₀ / 43₈ / 23₁₆) , repeated at least once

Group 1([\w\-]+)

Character Class[\w\-]+

+matches at least one character from the set below:

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

Regular Expression

(?<=^|(?<=[^.?\/[:alnum:]]))#+([\w\-]+)

New

 #cli
 #cli,
 #clocks
 #clocks,
 #clocksnotes
 #clocksnotes,
 #clockstxt
 #clockstxt,

["blablabla#querytip"](https://twitter.com...

["#querytip"](https://twitter.com...

#I'm

###multiple_pound_signs!

Regular Expression

Substitution