Added some regex into existing regular pattern

Question

I am not good regex and need to update following pattern without impacting other pattern. Any suggestion $ sign contain 1t0 4. $ sign always be begining of the line.( space may or may not be)

import re
data = " $$$AKL_M0_90_2K: Two line end vias (VIAG, VIAT and/or" 
patt = '^ (?:ABC *)?([A-Za-z0-9/\._\:]+)\s*: ? '
match = re.findall( patt, data, re.M )
print match

Note : data is multi line string

match should contain : "$$$AKL_M0_90_2K" this result

let me know if it's not clear still

user765443
– user765443

2016-02-26 08:35:08 +00:00
Commented Feb 26, 2016 at 8:35 — user765443
– user765443, Commented Feb 26, 2016 at 8:35

Wiktor Stribiżew · Accepted Answer · 2016-02-26 08:40:30Z

1

I suggest the following solution (see IDEONE demo):

import re
data = r" $$$AKL_M0_90_2K: Two line end vias (VIAG, VIAT and/or" 
patt = r'^\s*([$]{1,4}[^:]+)'
match = re.findall( patt, data, re.M )
print(match)

The re.findall will return the list with just one match. The ^\s*([$]{1,4}[^:]+) regex matches:

^ - start of a line (you use re.M)
\s* - zero or more whitespaces
([$]{1,4}[^:]+) - Group 1 capturing 1 to 4 $ symbols, and then one or more characters other than :.

See the regex demo

If you need to keep your own regex, just do one of the following:

Add $ to the character class (demo): ^ (?:ABC *)?([$A-Za-z0-9/._:]+)\s*: ?
Add an alternative to the first non-capturing group and place it at the start of the capturing one (demo): ^ ((?:ABC *|[$]{1,4})?[A-Za-z0-9/._:]+)\s*: ?

edited Feb 26, 2016 at 8:40

answered Feb 26, 2016 at 8:37

Wiktor Stribiżew

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3 Comments

user765443 Over a year ago

I was trying to add into this exiting one so other rule will not impact. is it possible. I mean add more into existing one "patt = '^ (?:ABC )? (\s)?([A-Za-z0-9/\._\:]+)\s*: ? '" like way

Wiktor Stribiżew Over a year ago

I added two more solutions based on your own regex. Note the . and : inside a character class do not have to be escaped. : does not have to be escaped anywhere in a Python regex.

user765443 Over a year ago

Thx for nice explanation

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