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- PCRE2 (PHP >=7.3)
- PCRE (PHP <7.3)
- ECMAScript (JavaScript)
- Python 2.7
- Golang (RE2)

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(?:\s*(?=\w+\.|.*as\s+|)(\*|\w+)(?=\s*(?=,|from)))

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ig

Non-capturing group

(?:\s*(?=\w+\.|.*as\s+|)(\*|\w+)(?=\s*(?=,|from)))

\s*

matches any whitespace character (equal to [\r\n\t\f\v ])* **Quantifier** — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)

Positive Lookahead

(?=\w+\.|.*as\s+|)

Assert that the Regex below matches

1st Alternative

\w+\.

\w+

matches any word character (equal to [a-zA-Z0-9_])+ **Quantifier** — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

\. matches the character . literally (case insensitive)

2nd Alternative

.*as\s+

.*

matches any character (except for line terminators)* **Quantifier** — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)

as matches the characters as literally (case insensitive)

\s+

matches any whitespace character (equal to [\r\n\t\f\v ])+ **Quantifier** — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

3rd Alternative — *null*, matches any position

1st Capturing Group

(\*|\w+)

1st Alternative

\*

\* matches the character * literally (case insensitive)

2nd Alternative

\w+

\w+

matches any word character (equal to [a-zA-Z0-9_])+ **Quantifier** — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

Positive Lookahead

(?=\s*(?=,|from))

Assert that the Regex below matches

\s*

matches any whitespace character (equal to [\r\n\t\f\v ])* **Quantifier** — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)

Positive Lookahead

(?=,|from)

Assert that the Regex below matches

1st Alternative

,

2nd Alternative

from

Global pattern flags

i modifier: **i**nsensitive. Case insensitive match (ignores case of [a-zA-Z])

g modifier: **g**lobal. All matches (don't return after first match)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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ig

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