Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
(?i)стена\s(?:\-\d|[\w\s])
"
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])
стена matches the characters стена literally (case insensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
{1} matches the previous token exactly one time (meaningless quantifier)
Non-capturing group
(?:\-\d|[\w\s])
1st Alternative
\-\d
\-
matches the character - literally (case insensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
[\w\s]
Match a single character present in the list below
[\w\s]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\w matches any word character (equivalent to [a-zA-Z0-9_])
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
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

Substitution

Processing...