regex specific char change by anther without change the found sentence

[Kirill Nudelman]

hi

i need to find and replace in hole text (.) to (_)

“CM_0402_H0.5”
“FB_MRT_BLM18P_4A_H0.75”

to

“CM_0402_H0_5”
“FB_MRT_BLM18P_4A_H0_75”

i want to leave the sentence as is and only change (.) to underscore

[PeterJones]

@Kirill-Nudelman ,

Doesn’t a normal Search > Replace, Find What = ., Replace with = _, Search Mode = Normal do that? It does for me.