matches the empty string, but only at point.
`word-start', `bow'
- matches the empty string, but only at the beginning or end of a
- word.
+ matches the empty string, but only at the beginning of a word.
`word-end', `eow'
matches the empty string, but only at the end of a word.
matches the empty string, but not at the beginning or end of a
word.
+`symbol-start'
+ matches the empty string, but only at the beginning of a symbol.
+
+`symbol-end'
+ matches the empty string, but only at the end of a symbol.
+
`digit', `numeric', `num'
matches 0 through 9.