To be honest, I think it's the kind of thing where you must practice a lot to get good at. I would chain exercises. So to add some useful links
Exercices : regexone.com/problem/matching_deci... regexcrossword.com/ alf.nu/RegexGolf
Useful regex to dissect and learn projects.lukehaas.me/regexhub/
Visualizers: regviz.org/ debuggex.com/
Nice links!
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To be honest, I think it's the kind of thing where you must practice a lot to get good at. I would chain exercises. So to add some useful links
Exercices :
regexone.com/problem/matching_deci...
regexcrossword.com/
alf.nu/RegexGolf
Useful regex to dissect and learn
projects.lukehaas.me/regexhub/
Visualizers:
regviz.org/
debuggex.com/
Nice links!