Regular Expressions 101

Non-Capturing Group(?:\s|^)

1st Alternative\s

\sany whitespace character

2nd Alternative^

^start of line

Group 1(Prefix:[a-zA-Z0-9][\w.-]*[^.]#\d+)

Prefix:the literal text Prefix: (case sensitive)

Character Class[a-zA-Z0-9]

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)

Character Class[\w.-]*

*matches any number of characters from the set below:

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negated Character Class[^.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\s|$)

1st Alternative\s

\sany whitespace character

2nd Alternative$

$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.

25 tokens

Regular Expression

(?:\s|^)(Prefix:[a-zA-Z0-9][\w.-]*[^.]#\d+)(?:\s|$)

New

Prefix:middle#113  build: xxxxxx  Prefix:middle#6
Prefix:middle#16026Prefix:middle#1111
 Prefix:middle#110  Prefix:middle.#2  Prefix:middl.e#111  Prefix:middle#112

Regular Expression

Extraction