Regular Expressions 101

Pro

^start of line

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1(_)?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-z]+

+matches at least one character from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2((_{2}|-{2})?[a-z0-9-]+)?

?repeats the group contents below at most once:

Group 3(_{2}|-{2})?

?repeats the group contents below at most once:

1st Alternative_{2}

_{2}the literal _ (95₁₀ / 137₈ / 5F₁₆) , repeated exactly 2 times

2nd Alternative-{2}

-{2}the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated exactly 2 times

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4(-{2}[a-z0-9-]+)?

?repeats the group contents below at most once:

-{2}the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated exactly 2 times

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z0-9]

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

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

$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

^\.(_)?[a-z]+-[a-z0-9-]+((_{2}|-{2})?[a-z0-9-]+)?(-{2}[a-z0-9-]+)?[a-z0-9]$

New

.o-layout

.c-btn--

.o-layout__item

.has-dropDown

.o-layout--fixed

.u-color-primary

.foo_bar

.s-cms-content

.title__sub

.t-light

.c-date-picker__calendar

.heading

.o-matrix__item--full

._c-footer__copyright