Add the multiline Regex flag to allow 'contains', 'like', 'startsWith' & 'endsWith' queries to work with multi-line strings.

[jfrumar]

In reference to issue https://github.com/balderdashy/sails-mongo/issues/220

[yf-hk]

Adding m flag is not correct. Compares to PHP, Javascript does not have built-in dot match all functionality. But you can use /[^]*/ or /[\S\s]*/ instead. multi-line search means ^ and $ should also match line beginnings and endings, so that's a different thing. Please also check my comment here #220

[particlebanana]

Done in #308