CODEWITHSUNDEEP
regexalphanumericdigit
Erik Telepovský
Erik Telepovský

Reputation: 543

Regex for optional alphanumeric prefix and mandatory numeric suffix

I am trying to build a regular expression which goal is to follow 3 rules:

(1) If the input is alphanumeric and it could be split into two groups containing letters and numbers, then letters are prefix and numbers are suffix. For example:

input: ABC123

output: prefix = ABC, suffix = 123

(2) If the input is numeric only, then there is no prefix, only suffix. For example:

input: 123

output: prefix = '', suffix = 123

(3) If the input is mixed alphanumeric, then all numbers to each other at the end of input are suffix and all other characters are prefix

input: A9B9C123

output: prefix = A9B9C, suffix = 123

I have tried this so far:

"(?P<prefix>\D*)(?P<suffix>\d*)"

This matches rules (1) and (2) but NOT (3).

"(?P<prefix>.*)(?P<suffix>[0-9]+)"

This matches rule (3), but breaks rules (1) and (2).

Note: Input always ends with a number and prefix is optional.

Thank you for your help.

Upvotes: 0

Views: 4003

Answers (1)

Avinash Raj
Avinash Raj

Reputation: 174696

Anchors are must important here. ^.*? will do a non-greedy match of zero or more characters until (?P<number>[0-9]+) the last number. And the last number is captured by the second group.

^(?P<prefix>.*?)(?P<number>[0-9]+)$

DEMO

Upvotes: 1

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