regex conditional statement (only parse numbers if string has a certain beginning) -


first used string returned relaystates, “1.0.0.0.1.1.0.0” parsed/grouped \d+, 8 switches used ‘format response’, e.g. {1} state each switch.

now need numbers out of string: “relays.1.0.0.0.1.1.0.0”

\d+ still numbers want them if string starts “relays"

can please explain how that?

thnx million in advance! edited icebear (today 00:24)

with .net engine, use regex (?<=^relays[\d.]*)\d+. regex engines don't support indefinite repetition in negative lookbehind assertion.

see live on regexhero.net.

explanation: 

(?<=     # assert following can matched before current position:  ^relays # start of string, followed "relays"  [\d.]*  # , number of digits/dots. )        # end of lookbehind assertion \d+      # match 1 or more digits.

with pcre engine, use (?:^relays\.|\g\.)(\d+) , access group 1 each match.

see live on regex101.com.

explanation: 

(?:        # start non-capturing group matches...  ^relays\. # either start of string , "relays." |          # or  \g\.      # position after previous match, followed "." )          # end of non-capturing group (\d+)      # match number , capture in group 1

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