Regular Expressions 101

\ban ASCII word boundary

Group 1([a-zA-Z]\w*)

Character Class[a-zA-Z]

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

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

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

Non-Capturing Group(?:[^(a-zA-Z0-9_]|$)

1st Alternative[^(a-zA-Z0-9_]

Negated Character Class[^(a-zA-Z0-9_]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

2nd Alternative$

$end of string, or before its final line terminator

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

\b([a-zA-Z]\w*)(?:[^(a-zA-Z0-9_]|$)

New

 a*sin(w*t) 
 a+b/c
 w3_so^2+y^2/2