Regular Expressions 101

Explanation

Pro

prefix the literal text prefix (case sensitive)

Group 1([a-z ]*)

Character Class[a-z ]*

*matches any number of characters from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

Group 2([a-z ]* \d*)

Character Class[a-z ]*

*matches any number of characters from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

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

\2the text saved by group 2

$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

prefix ([a-z ]*)([a-z ]* \d*)\2$

New

prefix a b c d e 123 d e 123
prefix a b c 123 c 123

prefix a b c d e 123 d e 123
prefix a b c 123 c 123