Regular Expressions 101

Pro

^start of line

Character Class[a-zA-Z_]?

?matches at most 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 (90₁₀) (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[\w.-]+

+matches at least one character from the set below:

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:@\d{4}-\d{2}-\d{2})?

?repeats the group contents below at most once:

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\d{4}a digit, repeated exactly 4 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

yangthe literal text yang (case sensitive)

$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

^[a-zA-Z_]?[\w.-]+(?:@\d{4}-\d{2}-\d{2})?\.yang$

New

iso_schematron_skeleton_for_xslt1.xsl
iso_schematron_skeleton_for_xslt1.yang

iso_schematron_skeleton_for_xslt1.xsl
iso_schematron_skeleton_for_xslt1.yang