c# - Regex extremely slow when close matching -

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i attempting fix regex searches html elements attributes named "langtoken" other permutations such "langtoken_title". if search langtoken using word boundary returns results ~1,750,000 character string in around 0.2 seconds if omit word boundary capture langtoken_title attributes spikes around 95 seconds.

the regex had was

<([^>\s]+) [^>]*langtoken([^>]*?(\\*)?/>|.*?<(\\*)?/\1>)

so far attempts have changed to

<([^>\s]+) [^>]*langtoken(?:\b|_)(?:[^>]*/>|.*?</\1>)

i should note in string being searched (an html document) there 1431 occurrences of elements langtoken attribute , 5 of langtoken_title attribute. believe near match causing issue not sure.

this first foray regex , appreciated in creating more efficient expression.


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