Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
[^+@ ](?=[#>])
"
gm
Match a single character not present in the list below
[^@ ]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
@ matches a single character in the list @ (case sensitive)
Positive Lookahead
(?=[#>])
Assert that the Regex below matches
Match a single character present in the list below
[#>]
#> matches a single character in the list #> (case sensitive)
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