help regex matches something presumably before after something else

i have garland xml lines feeling this

<_char font_name="/itc indent serif std bold" italic="true" />

but infrequently feeling this

<_char font_size="88175" italic="true" font_name="/itc indent serif std bold" />

here's i need do

• replace italic="true" italic="false each line contains itc indent serif std bold, regardless presumably comes before after italic part.

can finished unparalleled regex?

i'm looking real-time solution. i only have ton xml files have "mistake" i'm perplexing tellurian search-and-replace powergrep need unparalleled regex. scripting's wholly proceed it, following it.