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- PCRE2 (PHP >=7.3)
- PCRE (PHP <7.3)
- ECMAScript (JavaScript)
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- Java 8

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/

(?:\s*-\s*)+|\s{2,}

/

gm

1st Alternative

(?:\s*-\s*)+

Non-capturing group

(?:\s*-\s*)+

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

2nd Alternative

\s{2,}

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ]){2,} matches the previous token between 2 and unlimited times, as many times as possible, giving back as needed (greedy)

Global pattern flags

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

m modifier: **m**ulti 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.Try launching the debugger to find out why.

/

/

gm

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