I want to match a string that starts with at least 4 spaces and in multiples of 4. So 4, 8, 12.
What i've got so far only matches at least 4 spaces.So it accepts 4, 5, 6...
/^[\s]{4,}\+/
Put the pattern which matches exactly four spaces inside a group and then make that group to repeat one or more times. And also you need to add a negative lookahead at the end, so that it won't match the string which has four spaces at the start followed by another space.
/^(?:\s{4})+(?! )/
var s = " I have four spaces" var s1 = " I have five spaces" alert(/^(?:\\s{4})+(?! )/.test(s)) alert(/^(?:\\s{4})+(?! )/.test(s1))
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