Regular Expressions 101

Negative Lookbehind(?<!\S)

\Sany non-whitespace character

Positive Lookahead(?=[\w-]{7,14}(?!\S))

Character Class[\w-]{7,14}

{7,14}matches between 7 and 14 characters from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!\S)

\Sany non-whitespace character

Character Class[a-z0-9_-]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[A-Z]

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

Character Class[\w-]*

*matches any number of characters 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

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

(?<!\S)(?=[\w-]{7,14}(?!\S))[a-z0-9_-]*[A-Z][\w-]*

New

aaaaa123 ** bbbbb444 ** ccccc66 ** ddDddD77 ** eeeee667 abC -Ddag--