Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
(?i)PYTHON PROGRAMING
"
gm
(?i)
match the remainder of the pattern with the following effective flags: gmi
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
PYTHON PROGRAMING matches the characters PYTHON PROGRAMING literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gm

Test String