Regular Expressions 101

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(?<![src|href]\=\"(\n*|\s*)?)((?:https?):\/\/[\-A-Z0-9+\u0026\u2019@#\/%?=()~_|!:,.;]*[\-A-Z0-9+\u0026@#\/%=~()_|])
/
gi
All the errors detected are listed below, from left to right, as they appear in the pattern.
? The preceding token is not quantifiable
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
gi

Test String