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implement RegexUtils;
# matching and substitution functions
# evb@lucent.com
include "sys.m";
sys: Sys;
include "regexutils.m";
init()
{
if (sys == nil)
sys = load Sys Sys->PATH;
regex = load Regex Regex->PATH;
if (regex == nil)
raise "fail: Regex not loaded";
}
match(pattern: Regex->Re, s: string): string
{
pos := regex->execute(pattern, s);
if (pos == nil)
return "";
(beg, end) := pos[0];
return s[beg:end];
}
match_mult(pattern: Regex->Re, s: string): array of (int, int)
{
return regex->execute(pattern, s);
}
sub(text, pattern, new: string): string
{
return sub_re(text, regex->compile(pattern, 0).t0, new);
}
sub_re(text: string, pattern: Regex->Re, new: string): string
{
pos := regex->execute(pattern, text);
if (pos == nil)
return text;
(beg, end) := pos[0];
newline := text[:beg] + new + text[end:];
return newline;
}
subg(text, pattern, new: string): string
{
return subg_re(text, regex->compile(pattern, 0).t0, new);
}
subg_re(text: string, pattern: Regex->Re, new: string): string
{
oldtext := text;
while ( (text = sub_re(text, pattern, new)) != oldtext) {
oldtext = text;
}
return text;
}
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