1 files changed, 38 insertions, 0 deletions

diff --git a/src/gmutil.c b/src/gmutil.c
index ce1b68c7..e59e6649 100644
--- a/src/gmutil.c
+++ b/src/gmutil.c
@@ -904,3 +904,41 @@ const iGmError *get_GmError(enum iGmStatusCode code) {
     iAssert(errors_[0].code == unknownStatusCode_GmStatusCode);
     return &errors_[0].err; /* unknown */
 }
+
+int replaceRegExp_String(iString *d, const iRegExp *regexp, const char *replacement,
+                         void (*matchHandler)(void *, const iRegExpMatch *),
+                         void *context) {
+    iRegExpMatch m;
+    iString      result;
+    int          numMatches = 0;
+    const char  *pos        = constBegin_String(d);
+    init_RegExpMatch(&m);
+    init_String(&result);
+    while (matchString_RegExp(regexp, d, &m)) {
+        appendRange_String(&result, (iRangecc){ pos, begin_RegExpMatch(&m) });
+        /* Replace any capture group back-references. */
+        for (const char *ch = replacement; *ch; ch++) {
+            if (*ch == '\\') {
+                ch++;
+                if (*ch == '\\') {
+                    appendCStr_String(&result, "\\");
+                }
+                else if (*ch >= '0' && *ch <= '9') {
+                    appendRange_String(&result, capturedRange_RegExpMatch(&m, *ch - '0'));
+                }
+            }
+            else {
+                appendData_Block(&result.chars, ch, 1);
+            }
+        }
+        if (matchHandler) {
+            matchHandler(context, &m);
+        }
+        pos = end_RegExpMatch(&m);
+        numMatches++;
+    }
+    appendRange_String(&result, (iRangecc){ pos, constEnd_String(d) });
+    set_String(d, &result);
+    deinit_String(&result);
+    return numMatches;
+}