Regular Expressions 101

1st Alternative(^[^a-z\._\\])

Group 1(^[^a-z\._\\])

^start of line

Negated Character Class[^a-z\._\\]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

2nd Alternative(\s)

Group 2(\s)

\sa Unicode whitespace character

3rd Alternative.{256,}

.{256,}any Unicode character (except for line terminators), repeated at least 256 times

4th Alternative[^a-z0-9_\._\\]

Negated Character Class[^a-z0-9_\._\\]

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

5th Alternative([a-z]{1,2})[0-9]+

Group 3([a-z]{1,2})

Character Class[a-z]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

Character Class[0-9]+

+matches at least one character from the set below:

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

6th Alternative^[rc]$

^start of line

Character Class[rc]

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case insensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

$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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(^[^a-z\._\\])|(\s)|.{256,}|[^a-z0-9_\._\\]|([a-z]{1,2})[0-9]+|^[rc]$

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