Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=^.{1,10}$)

^start of line

.{1,10}any character (except for line terminators), repeated between 1 and 10 times

$end of line

Character Class[a-zA-z0-9\!\$\%\&]+

+matches at least one character from the set below:

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

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

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

\!the literal ! (33₁₀ / 41₈ / 21₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\%the literal % (37₁₀ / 45₈ / 25₁₆)

\&the literal & (38₁₀ / 46₈ / 26₁₆)

Non-Capturing Group(?: [a-zA-z0-9\!\$\%\&]+)*

*repeats the group contents below any number of times:

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[a-zA-z0-9\!\$\%\&]+

+matches at least one character from the set below:

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

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

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

\!the literal ! (33₁₀ / 41₈ / 21₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\%the literal % (37₁₀ / 45₈ / 25₁₆)

\&the literal & (38₁₀ / 46₈ / 26₁₆)

$end of line

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.

26 tokens

^(?=^.{1,10}$)[a-zA-z0-9\!\$\%\&]+(?: [a-zA-z0-9\!\$\%\&]+)*$

New

This is a sentence
0123456789
0123456789a

This is a sentence
0123456789
0123456789a