Regular Expressions 101

^start of line

Group 1(\w+?)

\w+?a Unicode word character, repeated at least once

Non-Capturing Group(?:_([nr]e\d*))?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2([nr]e\d*)

Character Class[nr]

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (case sensitive)

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

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

\d*a Unicode decimal digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(\w+)

\w+a Unicode word character, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(\w+)

\w+a Unicode word character, repeated at least once

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(\w+?)(?:_([nr]e\d*))?\.(\w+)\.(\w+)$

New

abc_ne.c.d
kc_E5_re.c.d
kc_E5_re13.c.d
kc_E5.c.d