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Appendix B Regular Expressions

The HEW editor allows you to include special characters in search strings when performing a find or replace

operation. These characters are listed in table B.1 and are detailed in the following pages.

Table B.1 Regular Expression Characters

Character Function

? Matches any single character (except a newline)

* Matches any number of occurrences (0 or more) of any character except a

newline

\n Matches a new line character

\t Matches a tab character

[ ] Matches any one character or range listed within the brackets

\ Overrides any following regular expression character

• Symbol: ?

Meaning: This character matches any single character, except the newline character.

Example: t?p matches “top”, “tip” but not “trap”.

• Symbol: *

Meaning: This character matches any number of occurrences (0 or more) of any character except a

newline. Thus, this character will not match across new lines. The * character will match as few

occurrences as are necessary to make the rest of the pattern match.

Example 1: t*o matches the “to” of “too”, the “tro” of “trowel” and the “ty o” of “sporty orange”

but not “smart orange” because the * character does not match across a new line.

• Symbol: \n

Meaning: This character matches the newline character.

\n would be used to search for line endings or in patterns that cross line boundaries.

Example 1: ;\n

matches every occurrence of a newline following a semicolon

Example 2: ;\nif

searches for a semicolon, a new line and a line beginning with “if”.

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