Clever Geek Handbook

Regular variable regexp

I am trying to match the following example:

ZU2A ZS6D-9 ZT0ER-7 ZR6PJH-12

It is a combination of letters and numbers (alphanumeric). Here's an explanation:

  • It always starts with capital (uppercase) Z
  • Following is always only ONE (1) from R, S, T or U "[R | S | T | U]"
  • Always follow only one (1) number "[0-9]"
  • Constantly always with a minimum ONE (1) and possibly a maximum of three (3) uppercase letters such as [AZ] {1,3}
  • Additionally follows "-" and minimum ONE (1) and maximum TWO (2) numbers

At the moment I have this:

Z[R|S|T|U][0-9][A-Z]{1,}(\-)?([0-9]{1,3})

But that doesn't sound like all samples.

EDIT: Here's an example of a complete line:

ZU0D>APT314,ZT1ER,WIDE1,ZS3PJ-2,ZR5STU-12*/V:/021414z2610.07S/02814.02Ek067/019/A=005475!w%<!

Any help would be appreciated.

thank

Danny

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1 answer


The main problem is that the entire extra part has to be surrounded by a single parenthesis, marked with ?

(= optional). In general, you want

Z[RSTU][0-9][A-Z]{1,3}(?:-[0-9]{1,2})?

A few additional notes:



  • Within a character group, you can simply list the characters. So, for 2, you want either [RSTU]

    or (?:R|S|T|U)

    .
  • The group in the form (?:example)

    instead (example)

    prevents the subexpression from being returned as a match. It does not affect the matching of the inputs.
  • You don't need to hide -

    with a backslash outside the character class.

Here's an example test case script in Python :

import re

s = r'Z[RSTU][0-9][A-Z]{1,3}(?:-[0-9]{1,2})?'

rex = re.compile(s)
for test in ('ZU2A', 'ZS6D-9', 'ZT0ER-7', 'ZR6PJH-12'):
    assert rex.match(test), test

long_test = 'ZU0D>APT314,ZT1ER,WIDE1,ZS3PJ-2,ZR5STU-12*/V:/021414z2610.07S/02814.02Ek067/019/A=005475!w%<!'
found = rex.findall(long_test)
assert found == ['ZU0D', 'ZT1ER', 'ZS3PJ-2', 'ZR5STU-12'], found
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