Regular Expressions 101

Pro

^start of line

Negated Character Class[^a\n\r]*

*matches any number of characters outside the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

\ban ASCII word boundary

Group 1([^\Wa]*a\w*)

Negated Character Class[^\Wa]*

*matches any number of characters outside the set below:

\Wany non-word character

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\w*any word character, repeated any number of times

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

^[^a\n\r]*\b([^\Wa]*a\w*)

New

The cat ate the dog
and the mouse

this is a test
a
when will this be matching?
@!#SSDF2#$@a#$dsfs$sdfdsdf