Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
nigg(a|er)
"
g
nig matches the characters nig literally (case sensitive)
g
matches the character g literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
1st Capturing Group
(a|er)
1st Alternative
a
a matches the character a literally (case sensitive)
2nd Alternative
er
er matches the characters er literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
g

Test String