Auto merge of #120023 - klensy:tidy-alloc, r=Mark-Simulacrum

tidy: reduce allocs

this reduces allocs in tidy from (dhat output)

```
==31349== Total:     1,365,199,543 bytes in 4,774,213 blocks
==31349== At t-gmax: 10,975,708 bytes in 66,093 blocks
==31349== At t-end:  2,880,947 bytes in 12,332 blocks
==31349== Reads:     5,210,008,956 bytes
==31349== Writes:    1,280,920,127 bytes
```
to
```
==66633== Total:     791,565,538 bytes in 3,503,144 blocks
==66633== At t-gmax: 10,914,511 bytes in 65,997 blocks
==66633== At t-end:  395,531 bytes in 941 blocks
==66633== Reads:     4,249,388,949 bytes
==66633== Writes:    814,119,580 bytes
```

<del>by wrapping regex and updating `ignore` (effect probably not only from `ignore`, didn't measured)</del>

also moves one more regex into `Lazy` to reduce regex rebuilds.

Author: bors