The issue is the ^ anchor and the character causing grief is a new line at the start of the line! If you change your match to /(\C\C\C\C)(.*)/s the problem is fixed. Note that there is no need for anchors in any case - you want the first four octets followed by anything so that will always match at the start of the string (unless there are fewer than 4 octets).

True laziness is hard work

In reply to Re^3: Pattern match not working sometimes by GrandFather
in thread Pattern match not working sometimes by dantheman1210

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