Split a character list based on conditions in Python Regex

Question

I have a character list in this format "EXECUTE SYS-SM-THIS-1004"

What's the efficient way to split this list based on the conditions:

From the list, consider the characters after EXECUTE, split them using hyphen(-) as delimiter
From the resulting list, first element must be equal to any one of [SYS, CSC, ISC]
Last word must be a 4 digit number
Contents between first and last words to be moved into a new list after removing the Leading and ending hyphens. Finally hyphen to be replaced with underscore.

Condition to find if the line has the work EXECUTE is working. How to check the other conditions?

if re.match('^\s*EXECUTE .*', line) or re.match('^\s*execute.*', line) :

Input:

a = ["EXECUTE SYS-SM-THIS-1004"]

Expected Output:

X = SYS
Y = SM_THIS
Z = SYS-SM-THIS-1004

that's just checking for both the cases. edited now

Osceria
– Osceria

2019-06-06 10:43:27 +00:00
Commented Jun 6, 2019 at 10:43 — Osceria
– Osceria, Commented Jun 6, 2019 at 10:43
You can use the re.I or IGNORECASE flag fot that.

tobias_k
– tobias_k

2019-06-06 10:46:01 +00:00
Commented Jun 6, 2019 at 10:46 — tobias_k
– tobias_k, Commented Jun 6, 2019 at 10:46

Rakesh · Accepted Answer · 2019-06-06 10:52:52Z

2

Using re.match

Ex:

import re
s = "EXECUTE SYS-SM-THIS-1004"
m = re.match(r"EXECUTE (?P<Z>(?P<X>SYS|CSC|ISC)\-(?P<Y>\S+)\-\d{4})$", s.strip())
if m:
    X = m.group("X")
    Y = m.group("Y").replace("-", "_")
    Z = m.group("Z")
    print(X, Y, Z)

Output:

('SYS', 'SM_THIS', 'SYS-SM-THIS-1004')

edited Jun 6, 2019 at 10:52

answered Jun 6, 2019 at 10:40

Rakesh

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6 Comments

tobias_k Over a year ago

This does not replace - with _ in Y, but doing this after the regex match would be trivial. But maybe use \S+ instead of .*??

Rakesh Over a year ago

Sorry did not see that info in the que.

Osceria Over a year ago

If the match fails for "SYS|CSC|ISC", how do the error get captured

Rakesh Over a year ago

@Osceria. If it does not match it will not come inside the if condition if m

Osceria Over a year ago

@Rakesh I'm just trying to understand how exactly does this regex work. Can you help me with that?

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