Regular Expressions 101

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2(ce)?

?repeats the group contents below at most once:

cethe literal text ce (case sensitive)

_?optionally matches the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 3(.*)

.*any character (except for line terminators), repeated any number of times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 4([0-9]{8})

Character Class[0-9]{8}

{8}matches exactly 8 characters from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5([A-Za-z]{1,20})?

?repeats the group contents below at most once:

Character Class[A-Za-z]{1,20}

{1,20}matches between 1 and 20 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 6([A-Za-z]{1,20})?

?repeats the group contents below at most once:

Character Class[A-Za-z]{1,20}

{1,20}matches between 1 and 20 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

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.

Search reference

Regular Expression

(.*?)_(ce)?_?(.*)_([0-9]{8})\.([A-Za-z]{1,20})?\.([A-Za-z]{1,20})?

hello_ce_world_20192212.json.xml
hello_world_20192212.json.xml